Treating people, not patients.
Offering highly personalized care and service, beyond expectation.
Meet Our Physicians
At One Medical Group, your health is our highest priority. We are a team of experienced, board-certified physicians and health care professionals who are dedicated to providing you with world-class medical care.
In order to keep you healthy, we start by getting to know you — your life, your needs, your concerns. We use the latest medical knowledge and technology to develop personalized diagnostic and treatment plans. And most importantly, we take time to explain ourselves clearly and listen to you.
Not only will you experience more one-on-one interaction with your doctor (both in the office and via email), but you'll also be matched with a primary care team dedicated to assisting you with your health care needs.
Review our primary care teams – and select a partner who works best for you.
Andrew Cunningham, MD
2410 California Street
- Specialty
- Family Medicine
- Expertise
- Anxiety, Depression, Insomnia
- Digestive Disorders
- Exercise, Nutrition, Weight Management
- Integrative Medicine
- Lifestyle Modification
- Musculoskeletal Conditions
- Stress Management
Andrew emphasizes integrative and preventive care, focusing on building therapeutic patient-doctor relationships and empowering patients through health education. Attentive and open-minded, he incorporates his study of herbal medicine and acupuncture into customized care plans that match his patients' personal health goals. After completing his undergraduate studies at the University of Virginia School of Engineering, Andrew went on to earn his MD from the University of Louisville School of Medicine and completed his residency in Family Medicine at UCSF Santa Rosa. He is certified through the American Board of Family Medicine.
Margit Dijkstra, MD
201 Spear Street
- Specialty
- Family Medicine
- Expertise
- Cardiovascular Disease
- Complex Medical Conditions
- Diabetes, Hypertension, Lipid Disorders
- Digestive Disorders
- Integrative Medicine
- Lifestyle Modification
- Works with
- Lynn Beach O'Neill, FNP-c
Margit blends conventional medicine with complementary approaches such as mind-body medicine and nutritional optimization (primarily through promotion of plant-based diets). After graduating with honors from Vassar College, Margit earned her MD from Ohio State University and went on to complete her residency in family medicine at Grant Medical Center. Her experience includes both private practice and medical directorship of Healthcare for the Homeless. She also participated in a fellowship in integrative medicine through the Arizona Center for Integrative Medicine. She is certified with the American Board of Family Medicine.
Kohar Der Simonian, MD
559 Clay Street
- Specialty
- Family Medicine
- Expertise
- Birth Control Counseling
- Complex Medical Conditions
- Exercise, Nutrition, Weight Management
- Lifestyle Modification
- Prenatal Care
- Preventive Health and Education
- Women's Health
- Works with
- Bernadette Donovan, ANP, WHNP
Kohar helps put patients at ease with her warm, empathetic manner and is committed to providing comprehensive, individualized care to each patient. She is especially proficient in treating women's health issues and counseling patients in contraception management. Kohar graduated with honors from the University of Vermont where she went on to earn her MD. She completed her residency in family and community medicine at UCSF, where she was a Global Health Clinical Scholar. Kohar was a Reproductive Health Fellow at the Institute for Urban Family Health in New York and served as faculty at Beth Israel's Family Medicine Residency Program. She is certified with the American Board of Family Medicine and is a member of the American Academy of Family Physicians.
Jennifer Young, MD
559 Clay Street
- Specialty
- Internal Medicine
- Expertise
- Complex Medical Conditions
- Diabetes, Hypertension, Lipid Disorders
- Hematology
- Lifestyle Modification
- Preventive Health and Education
- Stress Management
- Women's Health
Jennifer blends the scientific discipline of an academic clinician with the warmth and compassion of a community doctor. She takes great satisfaction in helping her patients understand the complexities and nuances of modern health care and has a special interest in coordinating care for patients with cancer. Jennifer graduated with honors from UNC Chapel Hill, received her MD from Georgetown University, and went on to complete her residency at Stanford University Hospital here she also obtained a year of subspecialty training in hematology and oncology. She is certified with the American Board of Internal Medicine.Note: sees patients age 18 and older.
Steven Chang, MD
201 Spear Street
- Specialty
- Family Medicine
- Expertise
- Allergies and Asthma
- Cardiovascular Disease
- Diabetes, Hypertension, Lipid Disorders
- Preventive Health and Education
- Skin Rashes and Biopsies
- Thyroid Disorders
Steven practices state-of-the-art medicine with an open-minded approach to diagnosis and treatment. He enjoys the wide spectrum of patients and conditions he encounters in primary care and works with individuals to formulate personalized health plans that will meet their unique needs. After finishing his undergraduate studies at The Johns Hopkins University & Bloomberg School of Public Health, Steven completed a fellowship at the National Institutes of Health and subsequently earned his MD from McGill University. He completed an internship at O'Connor Hospital-Stanford University and finished his residency in family and community medicine at UC Davis.
Jennifer Rhee, MD
2 Embarcadero Center, 2410 California Street
- Specialty
- Internal Medicine
- Expertise
- Birth Control Counseling
- Cardiovascular Disease
- Complex Medical Conditions
- Diabetes, Hypertension, Lipid Disorders
- Preventive Health and Education
- Sports Medicine
- Women's Health
Empathetic and responsive, Jennifer enjoys developing long-term relationships with her patients. She focuses on preventive care and is especially interested in women's health issues and treating patients with complex medical conditions, including endocrine and renal disorders. After graduating from Stanford University, Jennifer earned her MD from the University of Illinois in Chicago and completed her residency in internal medicine at the NYU School of Medicine. She is certified through the American Board of Internal Medicine. Note: sees patients age 18 and older.
Wayne Wolfe, MD
559 Clay Street
- Specialty
- Family Medicine
- Expertise
- Anxiety, Depression, Insomnia
- Diabetes, Hypertension, Lipid Disorders
- Lifestyle Modification
- Men's Health
- Preventive Health and Education
- Stress Management
- Works with
- Kristen Nelson, NP
Wayne is first and foremost a great listener, seeking to understand his patients' needs and expectations and to craft his treatment recommendations accordingly. Through the use of biopsychosocial principles, he helps patients modify their illnesses and restore balance to their lives. A graduate of Vassar College, Wayne completed his residency in family medicine at the University of Rochester and a fellowship in addiction medicine at UCSF, and practiced primary care at UC Berkeley before joining One Medical Group. He is certified with the American Board of Family Medicine.
Adrienne Kassis, MD
Larkspur, 2410 California Street
- Specialty
- Family Medicine
- Expertise
- Birth Control Counseling
- Exercise, Nutrition, Weight Management
- Preventive Health and Education
- Sports Medicine
- Travel Medicine
- Women's Health
- Works with
- Thomas Dodsworth, ANP
Adrienne starts by building strong alliances with her patients, getting to know them deeply and understanding their concerns thoroughly in order to deliver better care. She is especially interested in women's health, weight loss, nutrition and exercise. After completing her bachelor's in physiological science at UCLA, Adrienne earned her MD from Tufts University School of Medicine and went on to complete her residency in family medicine at Swedish Medical Center in Seattle. She has been practicing primary care medicine since 2004 and was most recently an assistant clinical professor of Family and Community Medicine at UCSF. Adrienne is certified through the American Board of Family Medicine.
Leah Rothman, DO
110 Sutter Street
- Specialty
- Family Medicine
- Expertise
- Birth Control Counseling
- Exercise, Nutrition, Weight Management
- Integrative Medicine
- Osteopathic Medicine
- Pregnancy and Fertility
- Preventive Health and Education
- Women's Health
- Works with
- Julie Ososke, NP
Drawing on her osteopathic and integrative medicine training, Leah provides patient-centered medical care in a holistic manner, including offering osteopathic manipulations. She treats patients with a compassionate and open-minded attitude and is particularly interested in managing a broad range of women's health issues from family planning to prenatal care. After studying nutrition and sociology at the University of Vermont, Leah went on to earn her DO from the New York College of Osteopathic Medicine and received additional training at the Center for Education and Development of Clinical Homeopathy. She completed her residency in urban family practice at Beth Israel Medical Center along with a fellowship in integrative medicine through a joint program with Andrew Weil's Center for Integrative Medicine at the University of Arizona.
Kimberly Young, MD
201 Spear Street
- Specialty
- Family Medicine
- Expertise
- Exercise, Nutrition, Weight Management
- Integrative Medicine
- Lifestyle Modification
- Preventive Health and Education
- Sports Medicine
- Stress Management
- Availability
- Limited appointment availability
Kim takes a comprehensive, integrative approach to healthcare and values developing long-lasting partnerships with her patients. A compassionate listener and thorough physician, she enjoys helping patients alter their lifestyles for optimal health and wellness. As a former elite gymnast, Kim is also particularly interested in musculoskeletal conditions. She received a bachelor's degree in human biology from Stanford University and continued at Stanford for her MD. After doing her residency training in family medicine at Oregon Health & Science University, Kim completed a fellowship in integrative medicine in a joint program through Andrew Weil's Center for Integrative Medicine at the University of Arizona and Oregon Health & Science University. Kim is certified with the American Board of Family Medicine.
Alicea Wu, MD
110 Sutter Street
- Specialty
- Family Medicine
- Expertise
- Birth Control Counseling
- Cardiovascular Disease
- Complex Medical Conditions
- Diabetes, Hypertension, Lipid Disorders
- Preventive Health and Education
- Skin Rashes and Biopsies
- Works with
- Angela Powlen, PA-C
Alicea is a dedicated and forthright physician with a wide spectrum of skills, from delicate office-based surgical procedures to management of chronic illness. She works to build meaningful relationships with her patients and is passionate about improving the quality of health care at every level. Following her undergraduate studies in molecular, cellular and developmental biology at the University of Colorado, she received her MD from New York Medical College and completed her residency in family medicine at UCSF and the University of Colorado. She is board-certified with the American Board of Family Medicine and is a clinical instructor in the department of Family and Community Medicine at UCSF.
Zeljko Milovanovic, MD, MS
2 Embarcadero Center
- Specialty
- Family Medicine
- Expertise
- Diabetes, Hypertension, Lipid Disorders
- Exercise, Nutrition, Weight Management
- Integrative Medicine
- Men's Health
- Musculoskeletal Conditions
- Preventive Health and Education
- Works with
- Jennie Cossman, PA-C
- Ellen O'Malley, FNP
Zeljko brings international experience and extensive training in integrative medicine to One Medical Group. His global perspective is reflected in his relaxed, empathic practice style and in his seamless fusion of evidence-based and alternative approaches. Fluent in five languages, Zeljko has lived and studied throughout Europe and the United States, has spent a distinguished year as a chief resident, and has earned high honors and numerous teaching awards along the way. He is certified with the American Board of Family Medicine and the American Board of Holistic Medicine and also holds a master's degree in exercise physiology.
Maricar Pacquing, DO
2 Embarcadero Center
- Specialty
- Internal Medicine
- Expertise
- Birth Control Counseling
- Chronic Pain Management
- Complex Medical Conditions
- Diabetes, Hypertension, Lipid Disorders
- Exercise, Nutrition, Weight Management
- Preventive Health and Education
- Women's Health
- Works with
- L. Desiree Dougherty, PA-C
- Lina Nazar, FNP-c
Maricar is an accomplished doctor with wide-ranging expertise and a holistic philosophy of care. Her friendly, relaxed manner brings comfort to the most anxious patients and reassurance to those with serious illness. Following medical school, Maricar completed a residency in internal medicine at Seton Hall University and worked for several years in a busy practice in New York before moving to San Francisco to join One Medical Group. She is certified with the American Board of Internal Medicine ad the American Board of Osteopathic Medicine.Note: sees patients age 18 and older.
Anand Singh, MD
110 Sutter Street
- Specialty
- General Medicine
- Expertise
- Diabetes, Hypertension, Lipid Disorders
- Ear, Nose and Throat Diseases
- Lifestyle Modification
- Preventive Health and Education
- Thyroid Disorders
Anand blends the precise skills of a surgeon with the compassion and holistic view of a generalist. Focusing on wellness and chronic disease prevention, he also provides expert care for acute problems and always takes time to explain diagnostic and treatments option clearly. Anand also has extensive experience in otolaryngology (the study of diseases of the ear, nose and throat) and prior to joining One Medical Group was a resident at UC Davis.
Daniel Dinenberg, MD
110 Sutter Street
- Specialty
- Family Medicine
- Expertise
- Exercise, Nutrition, Weight Management
- Integrative Medicine
- Lifestyle Modification
- Preventive Health and Education
- Skin Rashes and Biopsies
- Stress Management
- Works with
- Amber Weiss, PA-C, LAc
Dan practices a unique blend of conventional and holistic medicine, drawing on his extensive experience with integrative techniques like healing touch, guided imagery and yoga. By fostering an understanding of the deep connections between body, mind and spirit, Dan seeks to help every patient unlock his or her own innate healing ability. He received his MD from the Hahnemann College of Medicine and completed his residency in family practice through UCSF. Dan is a fellow of the Wilderness Medical Society, is a clinical instructor at UCSF, and is certified with both the American Board of Family Medicine and the American Board of Holistic Medicine.
Bruce Heller, MD
Larkspur
- Specialty
- Family Medicine
- Expertise
- Birth Control Counseling
- Exercise, Nutrition, Weight Management
- Integrative Medicine
- Lifestyle Modification
- Preventive Health and Education
- Stress Management
- Availability
- No appointment availability
Bruce believes that good nutrition, physical activity and stress reduction are pillars of optimal health. He integrates current medical therapies with time-honored traditions that promote healing to prevent and treat illness. Using lifestyle changes, acupuncture and mind-body techniques, he helps patients on their journey to more robust health. Bruce received his MD from Case Western Reserve University, completed his residency through UCSF, and studied medical acupuncture in Beijing, China and with Stanford and UCLA. He spent several years as an urgent care physician in San Rafael before joining One Medical Group. He is certified with the American Board of Family Medicine and is a clinical instructor at UCSF.
Sally Ward, MD, MPH
Larkspur
- Specialty
- Family Medicine
- Expertise
- Adolescent Medicine
- Integrative Medicine
- Lifestyle Modification
- Preventive Health and Education
- Women's Health
- Availability
- Limited appointment availability
Sally practices holistic family medicine with an emphasis on disease prevention. An energetic and dedicated caregiver, she is also an accomplished physician leader with a passion for quality improvement. After receiving her undergraduate degree from Wellesley College and her MD from Virginia Commonwealth University, Sally went on to complete her residency in family medicine at Dartmouth University, where she also obtained a master's degree in public health and held a chief residency position in preventive medicine. She is certified with both the American Board of Family Medicine and the American Board of Preventive Medicine.
Jade Schechter, MD
Larkspur
- Specialty
- Family Medicine
- Expertise
- Digestive Disorders
- Exercise, Nutrition, Weight Management
- Integrative Medicine
- Lifestyle Modification
- Preventive Health and Education
- Stress Management
- Women's Health
- Availability
- Limited appointment availability
Jade is a truly integrative doctor, blending evidence-based practice with a down-to-earth communication style and an embrace of complementary approaches such as functional medicine. She tailors her recommendations for each individual patient, resulting in treatment plans that are efficiently achievable. Following her undergraduate work at Stanford University, Jade completed her MD and her residency in family medicine at Tufts University (where she also became an AOA scholar) and studied medical acupuncture and mind-body medicine at Harvard. She is certified with the American Board of Family Medicine.
Arnold Lee, MD
2 Embarcadero Center
- Specialty
- Internal Medicine
- Expertise
- Complex Medical Conditions
- Diabetes, Hypertension, Lipid Disorders
- Men's Health
- Preventive Health and Education
- Sports Medicine
- Thyroid Disorders
- Availability
- Limited appointment availability
- Works with
- Hana Yoshikawa, RPA-C, MPH
Arnold is an incisive internist who approaches clinical problems with persistence and determination while maintaining a relaxed and forthright style. Adept at everything from office-based surgical procedures to management of complex health problems, he is especially interested in sports injuries, exercise medicine and disease prevention. Above all, Arnold values long-term, collaborative relationships with his patients. He earned his medical degree at the Royal College of Surgeons in Ireland and ompleted his residency in internal medicine at Columbia University, and was among the first physicians to join One Medical Group.Note: sees patients age 18 and older.
Steven Winiarski, DO
559 Clay Street
- Specialty
- Family Medicine
- Expertise
- Diabetes, Hypertension, Lipid Disorders
- Lifestyle Modification
- Men's Health
- Osteopathic Medicine
- Preventive Health and Education
- Skin Rashes and Biopsies
- Sports Medicine
- Availability
- Limited appointment availability
Steven is a seasoned practitioner of comprehensive adult primary care. He views the doctor-patient relationship as a true partnership, emphasizing communication and shared decision-making. A graduate of Emory University and the Chicago College of Osteopathic Medicine, Steven spent five years practicing and teaching as an associate professor of medicine in Georgia before moving to the Bay Area to join One Medical Group. He is certified with the American Board of Family Medicine.
Jenny-Viva Collisson, MD
559 Clay Street, Larkspur
- Specialty
- Mind-Body Medicine
- Expertise
- Anxiety, Depression, Insomnia
- Exercise, Nutrition, Weight Management
- Integrative Medicine
- Lifestyle Modification
- Stress Management
- Women's Health
- Availability
- Limited appointment availability
On maternity leave and returning late spring. Jenny-Viva practices integrative care with a repertoire that includes mind-body medicine, energy psychology, nutrition counseling and emotional freedom techniques. By facilitating the identification and elimination of core issues and limiting beliefs, she enables patients to transform themselves and attain healthy, vibrant, joyful lives. Jenny-Viva earned her medical degree from UCLA, completed her family medicine residency at UCSF, and has pursued extensive training in alternative medicine. She is dually certified with the American Board of Family Medicine and the American Board of Holistic Medicine. Learn more about our offerings in complementary and alternative medicine.
Andrew Diamond, MD, PhD
2 Embarcadero Center
- Specialty
- Internal Medicine
- Expertise
- Cardiovascular Disease
- Complex Medical Conditions
- Diabetes, Hypertension, Lipid Disorders
- Preventive Health and Education
- Thyroid Disorders
- Availability
- Limited appointment availability
- Works with
- Lisa Mihaly, FNP
- Meg Scott, FNP
Andrew focuses on preventive medicine, chronic disease management and patient empowerment though education and use of health information technology. He considers every office visit to be an opportunity to work on all aspects of a patient's health. After his undergraduate studies at Stanford, Andrew received his MD from the University of Colorado, where he also earned a PhD in immunology and microbiology and went on to complete a residency in internal medicine at Stanford University Medical Center. He is certified with the American Board of Internal Medicine and is a clinical instructor at the UCSF School of Medicine.Note: sees patients age 18 and older.
Thomas Lee, MD (Medical Director)
2 Embarcadero Center
- Specialty
- Internal Medicine
- Expertise
- Complex Medical Conditions
- Men's Health
- Preventive Health and Education
- Availability
- Limited appointment availability
Tom specializes in primary care internal medicine with an emphasis on preventive health, complex cases and quality improvement. He graduated from Yale University and the University of Washington School of Medicine, and completed his residency at Harvard's Brigham and Women's Hospital before serving as editor-in-chief for the widely used drug reference application Epocrates. He then founded One Medical Group as a step toward improving primary care delivery. Though he has limited appointment availability, Tom works with an excellent group of colleagues who share his commitment to high-quality patient care and service.
Jeannette Lager, MD, MPH
559 Clay Street
- Specialty
- Obstetrics and Gynecology
- Expertise
- Abnormal Pap Smears and Colposcopy
- Complex Gynecological Disorders
- IUD Insertion
- Women's Health
On maternity leave starting in January and expected to return in the Spring. Felicia Lester, MD, MPH, Jeannette’s UCSF colleague, will be covering in her absence As a clinical instructor at UCSF, Jeannette brings highly skilled obstetrics and gynecology expertise to One Medical Group — with an approach characterized by empathy and attentiveness to each office visit. Viewing the doctor-patient relationship as an opportunity for collaboration, Jeannette is particularly adept at caring for pregnant patients in addition to treating everything from menstrual disorders to fibroids. Patients who choose Jeannette as an obstetrician can expect to deliver at UCSF. Jeannette earned her MD at the University of Minnesota and completed her training in obstetrics and gynecology at the University of North Carolina.
Thomas Dodsworth, ANP
Larkspur
- Expertise
- Diabetes, Hypertension, Lipid Disorders
- Exercise, Nutrition, Weight Management
- Lifestyle Modification
- Musculoskeletal Conditions
- Skin Rashes and Biopsies
- Sports Medicine
- Works with
- Adrienne Kassis, MD
Thomas entered the field of primary care because he enjoys focusing on keeping patients well. He takes a common-sense approach to medicine and encourages patients to invest proactively in their health. He is particularly interested in management of infectious diseases and pulmonary issues. Thomas received his RN and master's degrees from UCSF and gained experience in the emergency departments of UCSF and Marin General Hospital before most recently working as a nurse practitioner in Santa Rosa. He is certified as an Adult Nurse Practitioner through the AANP.
Jennie Cossman, PA-C
2 Embarcadero Center
- Expertise
- Allergies and Asthma
- Birth Control Counseling
- Diabetes, Hypertension, Lipid Disorders
- Lifestyle Modification
- Preventive Health and Education
- Skin Rashes and Biopsies
- Women's Health
- Availability
- No appointment availability
- Works with
- Zeljko Milovanovic, MD, MS
- Ellen O'Malley, FNP
On leave and expected return in early 2013. Jennie puts patients at ease with her combination of sophisticated clinical skills and Southern charm. She is proficient in all aspects of primary care and cites good communication and accessibility as the cornerstones of her practice philosophy. Jennie received her bachelor's degree in preventive medicine from the University of Georgia, where she graduated magna cum laude and went on to study at the Medical University of South Carolina, again graduating at the top of her class. She is certified with the NCCPA.
Bernadette Donovan, ANP, WHNP
559 Clay Street
- Specialty
- Adult Medicine and Women's Health
- Expertise
- Birth Control Counseling
- Integrative Medicine
- Musculoskeletal Conditions
- Prenatal Care
- Preventive Health and Education
- Women's Health
- Works with
- Kohar Der Simonian, MD
Bernadette practices comprehensive primary care with an emphasis on patient motivation and empowerment. Adept at managing a broad range of health problems, she listens carefully and nurtures her patients to become active partners in their own health maintenance. After her undergraduate studies at Kenyon College, Bernadette completed her nursing and advanced practice training at Yale University, where she also served as a clinical instructor for several years. She is certified in adult medicine ad women's health through the ANCC.Note: sees patients age 18 and older.
L. Desiree Dougherty, PA-C
2 Embarcadero Center
- Expertise
- Cardiovascular Disease
- Diabetes, Hypertension, Lipid Disorders
- Digestive Disorders
- Ear, Nose and Throat Diseases
- Preventive Health and Education
- Thyroid Disorders
- Women's Health
- Works with
- Maricar Pacquing, DO
- Lina Nazar, FNP-c
Desiree is committed to creating treatment plans that are tailored to each patient's unique situation, rather than practicing one‐size‐fits‐all medicine. With extensive experience in internal medicine practices, she is passionate about everything from urgent care to handling chronic illnesses like hypertension and diabetes. After studying food science and human nutrition at the University of Florida, Desiree received her master's degree through the Physician Assistant program at the School of Allied Health Science at the University of South Alabama. She is certified through the NCCPA and has been a member of the American Academy of Physician Assistants since 2005.
Lisa Mihaly, FNP
2 Embarcadero Center
- Specialty
- Family Medicine
- Expertise
- Allergies and Asthma
- Birth Control Counseling
- Diabetes, Hypertension, Lipid Disorders
- Lifestyle Modification
- Preventive Health and Education
- Women's Health
- Works with
- Andrew Diamond, MD, PhD
- Meg Scott, FNP
Lisa (pronounced Leeza) strikes a balance of compassion, pragmatism and intellectual depth, working with her patients to create treatment plans that are realistic and efficient. She handles all aspects of primary care and has special interests in women's health and adolescent health, having spent several years working at Planned Parenthood and other clinics for the underserved throughout the Bay Area. She received her undergraduate degree from Harvard and her clinical training at UCSF, where she still works as an assistant professor in the UCSF School of Nursing. She is certified in family practice with the ANCC.
Lina Nazar, FNP-c
2 Embarcadero Center
- Specialty
- Family Medicine
- Expertise
- Allergies and Asthma
- Birth Control Counseling
- Hematology
- Preventive Health and Education
- Works with
- Maricar Pacquing, DO
- L. Desiree Dougherty, PA-C
On maternity leave and returning this summer. Lina's friendly, engaging manner and broad base of knowledge creates a comfortable environment for addressing her patients' concerns. She has developed a strong focus on preventive care and patient education, using electronic communication to make healthcare more convenient for her patients. After completing her bachelor's degree in nursing and molecular biology, Lina earned her master's degree in primary care nursing from Columbia University. She has since worked with patients undergoing cancer therapy. She is certified through the American Academy of Nurse Practitioners.
Kristen Nelson, NP
559 Clay Street
- Expertise
- Anxiety, Depression, Insomnia
- Diabetes, Hypertension, Lipid Disorders
- Exercise, Nutrition, Weight Management
- Lifestyle Modification
- Musculoskeletal Conditions
- Preventive Health and Education
- Women's Health
- Works with
- Wayne Wolfe, MD
Kristen perfectly embodies One Medical Group's patient-centered approach to health care. She focuses on building longstanding relationships, which she sees as essential for helping her patients lead healthier lives. After graduating from Syracuse University, Kristen went on to earn her master's from UCSF's Family Nurse Practitioner program. She has extensive experience in chronic disease management as well as urgent care, and is especially interested in mental health. She is certified through the ANCC.
Ellen O'Malley, FNP
2 Embarcadero Center
- Specialty
- Family Medicine
- Expertise
- Birth Control Counseling
- Diabetes, Hypertension, Lipid Disorders
- Exercise, Nutrition, Weight Management
- Preventive Health and Education
- Women's Health
- Works with
- Zeljko Milovanovic, MD, MS
- Jennie Cossman, PA-C
Attentive and approachable, Ellen is sensitive to the unique needs of each individual patient. She values preventive medicine and focuses on building and maintaining relationships with patients in order to help them achieve healthier lives. She has experience in adult and adolescent primary care, urgent care, and reproductive and women's health, and she is especially interested in treating hypertension, diabetes, asthma, hyperlipidemia, and sexually transmitted infections. Ellen completed her undergraduate training at UC Berkeley and received her master's of science in nursing from UCSF.
Lynn Beach O'Neill, FNP-c
201 Spear Street
- Expertise
- Chronic Pain Management
- Complex Medical Conditions
- Exercise, Nutrition, Weight Management
- Lifestyle Modification
- Pregnancy and Fertility
- Sports Medicine
- Women's Health
- Works with
- Margit Dijkstra, MD
With a compassionate and approachable demeanor, Lynn uses her clinical knowledge to help her patients achieve their goals for health and well-being. She views her role as an advocate for her patients, helping them manage serious health conditions such as breast cancer, fertility issues, chronic pain, and sports injuries. Having completed her undergraduate studies at Santa Clara University, Lynn went on to graduate with honors from the University of Pennsylvania and completed her master's of science in nursing through the Family Nurse Practitioner Program at UCSF. She has extensive nursing experience and most recently worked as a nurse practitioner at the UCSF Comprehensive Cancer Center. She is certified as a family nurse practitioner through the ANCC.
Julie Ososke, NP
110 Sutter Street
- Specialty
- Family Medicine
- Expertise
- Allergies and Asthma
- Birth Control Counseling
- Diabetes, Hypertension, Lipid Disorders
- Integrative Medicine
- Preventive Health and Education
- Stress Management
- Works with
- Leah Rothman, DO
Julie combines her evidence-based, integrative approach to medicine with a patient- centered, holistic focus. Thorough and caring, she takes the time to listen to her patients in order to get at the root of a disease or problem and promote optimal physical and mental health. Julie completed her undergraduate degrees at UC Davis and Columbia University and went on to earn her master's in nursing from UCSF. Prior to her years as a family nurse practitioner, she worked as a triage nurse and doula. She is fluent in Spanish and is certified in family practice with the ANCC.
Angela Powlen, PA-C
110 Sutter Street
- Expertise
- Birth Control Counseling
- Diabetes, Hypertension, Lipid Disorders
- Exercise, Nutrition, Weight Management
- Integrative Medicine
- Preventive Health and Education
- Women's Health
- Works with
- Alicea Wu, MD
Angela is an experienced provider with a highly collaborative approach to primary care and a strong interest in women's health. She listens carefully, providing support and guidance so that her patients can be well-informed partners in the medical decision-making process. Educated at Rutgers University, Angela worked at Planned Parenthood for many years prior to joining One Medical Group. She is certified with the NCCPA.
Meg Scott, FNP
2 Embarcadero Center
- Specialty
- Family Medicine
- Expertise
- Birth Control Counseling
- Diabetes, Hypertension, Lipid Disorders
- Lifestyle Modification
- Preventive Health and Education
- Sports Medicine
- Women's Health
- Works with
- Andrew Diamond, MD, PhD
- Lisa Mihaly, FNP
Meg is an accomplished provider with advanced skill in all aspects of primary care. Her common-sense, easygoing manner is a perfect complement to her strong scientific grounding and evidence-based practice. Prior to joining One Medical Group, Meg studied nursing at Yale and went on to become an associate clinical professor at UCSF, where she spent many years as a leader and beloved educator of future nurse practitioners. Meg is certified in family practice with the ANCC.
Amber Weiss, PA-C, LAc
110 Sutter Street
- Expertise
- Allergies and Asthma
- Chronic Fatigue
- Digestive Disorders
- Ear, Nose and Throat Diseases
- Lifestyle Modification
- Stress Management
- Works with
- Daniel Dinenberg, MD
With a background in acupuncture and Chinese Medicine, Amber has a strong interest in preventing and treating chronic illnesses by focusing on their underlying causes. She has expertise in identifying and managing gluten intolerance and other food intolerance, particularly in the setting of concomitant autoimmune disorders. After graduating with honors from Stanford University, Amber went on to earn her master's in Traditional Chinese Medicine from Five Branches University and then returned to Sanford for her Physician Assistant training. Prior to joining One Medical Group, she ran a busy acupuncture clinic in Santa Cruz, and then worked as a PA for a private allergy, asthma and immunology group in San Francisco. Amber is an advocate for LGBT health and an active member of GLMA, and is certified with the NCCPA.
Hana Yoshikawa, RPA-C, MPH
2 Embarcadero Center
- Expertise
- Diabetes, Hypertension, Lipid Disorders
- HIV Management
- Preventive Health and Education
- Smoking Cessation
- Sports Medicine
- Works with
- Arnold Lee, MD
Hana brings compassion and patience to the exam room and fully embraces One Medical Group's patient-centered approach to medicine. She emphasizes preventive health and holistic care and is especially interested in treating orthopedic injuries, infectious diseases and diabetes. After completing her undergraduate degree at UCLA and earning her master's from George Washington University, Hana gained experience as a physician assistant in primary care and emergency medicine in New York. She speaks Spanish, French and Japanese and is certified with the NCCPA.
April Blake, ND
Larkspur
- Specialty
- Naturopathic Medicine
- Expertise
- Allergies and Asthma
- Anxiety, Depression, Insomnia
- Cardiovascular Disease
- Diabetes, Hypertension, Lipid Disorders
- Digestive Disorders
- Exercise, Nutrition, Weight Management
- Women's Health
April works to empower her patients through education, emphasizing preventive medicine and the innate healing potential of the human body. She is proficient in botanical, homeopathic, nutritional and physical medicine, and treats a wide variety of conditions including endocrine imbalances, immune system disorders and stress, always focusing on the root cause of the disease. April received her BA from UC Santa Barbara and her ND from Bastyr University, in Seattle, WA. Learn more about our offerings in complementary and alternative medicine.
Jennifer Mann, ND
2 Embarcadero Center
- Specialty
- Naturopathic Medicine
- Expertise
- Anxiety, Depression, Insomnia
- Diabetes, Hypertension, Lipid Disorders
- Digestive Disorders
- Exercise, Nutrition, Weight Management
- Thyroid Disorders
- Women's Health
Jenny focuses on forming long-term relationships with her patients and providing them with comprehensive preventive care and wellness education. With her extensive experience in integrative primary care, she utilizes herbs, supplements, prescription medications and diet and lifestyle modification to treat complex illnesses such as hypothyroidism, IBS and anxiety. Jenny received her naturopathic medical degree from Bastyr University and completed her residency at the Integrated Health Center, both in Seattle. Learn more about our offerings in complementary and alternative medicine.
Shaila Schwartz, ND
110 Sutter Street
- Specialty
- Naturopathic Medicine
- Expertise
- Allergies and Asthma
- Anxiety, Depression, Insomnia
- Diabetes, Hypertension, Lipid Disorders
- Digestive Disorders
- Immune System Health
- Pregnancy and Fertility
- Women's Health
On maternity leave and returning early 2012 Shaila uses naturopathic medicine to help patients balance their mental, emotional and physical states. She is committed to identifying the root causes of her patients' illnesses and has special interests in naturopathic treatment of cardiovascular diseases, endocrine imbalances and autoimmune conditions. Shaila completed her academic and clinical training at The Canadian College of Naturopathic Medicine in Toronto, the leading school of naturopathic medicine in Canada. She is a professional member of the California Naturopathic Doctors Association (CNDA) and the American Association of Naturopathic Physicians (AANP). Learn more about our offerings in complementary and alternative medicine.
Alex Tan, ND
110 Sutter Street, 2 Embarcadero Center
- Specialty
- Naturopathic Medicine
- Expertise
- Allergies and Asthma
- Chronic Fatigue
- Digestive Disorders
- Exercise, Nutrition, Weight Management
- Thyroid Disorders
Alex works with his patients to address the underlying causes of health problems, drawing on his thorough knowledge of conventional and alternative medicine. He has broad-based skills and has cultivated special interests in digestive disorders, thyroid disorders and integrative cancer treatment. Alex received his naturopathic medical degree from the esteemed Bastyr University and completed his clinical training at the Bastyr Center for Natural Health, both in Seattle. He is a member of the American Association of Naturopathic Physicians, the California Naturopathic Doctors Association and the Institute of Functional Medicine. Learn more about our offerings in complementary and alternative medicine.
Jeannie Bianchi, LAc
110 Sutter Street
- Specialty
- Acupuncture and Chinese Herbal Medicine
- Expertise
- Chronic Pain Management
- Digestive Disorders
- Musculoskeletal Conditions
- Pregnancy and Fertility
- Women's Health
Jeannie employs acupuncture, Traditional Chinese Medicine and nutrition guidance to address both the symptoms and the root causes of her patients' problems. Her techniques are applicable to a wide variety of health concerns, from post-partum maternal care to autoimmune disease to palliative care for patients with cancer. Jeannie received extensive training from the Pacific College of Oriental Mediine and Chengdu University in China and has been in practice in San Francisco since 2005. She is certified with the NCCAOM. Learn more about our offerings in complementary and alternative medicine.
Michelle Kuroda, LAc
110 Sutter Street
- Specialty
- Acupuncture and Chinese Herbal Medicine
- Expertise
- Allergies and Asthma
- Anxiety, Depression, Insomnia
- Chronic Pain Management
- Digestive Disorders
- Musculoskeletal Conditions
- Women's Health
Michelle uses a combination of acupuncture and Chinese herbs to treat her patients' imbalances and restore well-being. Her skills are applicable to a wide range of illnesses, including migraine and tension headaches, insomnia, irritable bowel syndrome, menstrual irregularities, menopausal symptoms and chronic sinusitis. Michelle is a graduate of NYU and the Meiji College of Oriental Medicine in Berkeley. She is licensed with the California State Acupuncture Board. Learn more about our offerings in complementary and alternative medicine.
Karyn Duggan, CNC
559 Clay Street
- Specialty
- Nutrition and Lifestyle
- Expertise
- Anxiety, Depression, Insomnia
- Diabetes, Hypertension, Lipid Disorders
- Digestive Disorders
- Exercise, Nutrition, Weight Management
- Preventive Health and Education
Karyn considers good nutrition to be the cornerstone of a healthy lifestyle, influencing everything from mood and energy level to cardiovascular disease risk and overall longevity. As a Certified Nutritional Consultant, she listens compassionately and helps patients design realistic and practical nutrition plans. As a Certified Natural Chef, Karyn also helps clients see just how easy it is to prepare and eat nutritious food. She holds multiple certifications in nutrition counseling and education from Bauman College in Berkeley and the British College of Nutrition and Health in London. Learn more about our offerings in complementary and alternative medicine.
Samantha Treyve, MS, RD
559 Clay Street
- Specialty
- Nutrition and Lifestyle
- Expertise
- Diabetes, Hypertension, Lipid Disorders
- Digestive Disorders
- Exercise, Nutrition, Weight Management
- Integrative Medicine
- Lifestyle Modification
As a Registered Dietitian (RD), Samantha fuses her knowledge of science and current research findings with a deep understanding of the healing properties of nutrition. She enjoys engaging with patients in an integrative setting – providing initial assessments, follow-up consultations, and nutritional education. Samantha emphasizes realistic dietary recommendations for illness prevention and the management of conditions such as diabetes and heart disease. After earning her master's of science in nutrition at Bastyr University, Samantha gained experience as a dietetic intern in Tucson, Arizona and was most recently an RD at Marin General Hospital. She is a member of the American Dietetic Association (ADA) and is certified in Adult Weight Management through the ADA.