Medical Directors

Executive Leadership
Board of Directors
Medical Directors

Medical Directors

Smita Chandra, MD
Medical Director Palliative & Transitional Care

Smita Chandra MD, has been with John Muir Medical Group since 2003. After finishing her residency at St Mary’s Medical Center SF in 2002, she stayed there another year as Chief Resident. She started as a hospitalist at the Walnut Creek Medical Center in 2003. Over the years, Dr. Chandra has spearheaded the initiation and growth of the Skilled Nursing Facility program, post-discharge clinic and is currently Director for Care Transitions and Inpatient Palliative Care program for John Muir Health. Coordinating care across continuum for medically complex patients is of paramount importance for Dr. Chandra.

Dr. Chandra has been on John Muir Medical Group board of directors since 2014 and chairs the Governance committee. Dr. Chandra is board certified in Internal Medicine and Hospice and Palliative Medicine.

In her free time, Dr. Chandra likes travelling, and spending time with her family and her dog.

Anna Chang, MD
Medical Director of Endocrinology

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Anna Chang, MD joined John Muir Medical Group in 2005, splitting time between an endocrinology practice and diabetes research in Concord. She currently is the Medical Director of Endocrinology, as well as the Medical Director of John Muir Physician Network’s Clinical Research Center, where she is an investigator in clinical trials. Dr. Chang is also actively involved with the Evidence Based Practice committee, as well as a member of the Accountable Care Organization board.

Dr. Chang grew up in Danville, California, and attended UC Berkeley before spending 10 years in San Diego at UCSD Medical Center for medical school, residency, chief residency, and her endocrinology fellowship. She returned to settle down in the East Bay with her husband, who is also a physician, and her 2 daughters. In her spare time, Dr. Chang likes to travel.

Deborah Greer, MD
Executive Medical Director Urgent Care & After Hours Services

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Dr. Deborah Greer has been working in Urgent Care with John Muir Medical Group since 2000, currently working in clinic along with administrative responsibilities to the group. She is currently Executive Medical Director for Urgent Care and After Hours Services for John Muir Medical Group.

Dr. Greer is also involved in Virtual Medicine and works at Manor Care on occasion. She received her medical degree from UC Davis and trained at UCSF.

Marcy Haas, MD
Medical Director Compliance - Ambulatory Services

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Dr. Haas has been practicing medicine since 2002. She joined John Muir Medical Group in 2013 and is currently the Ambulatory Medical Director of Compliance. Dr. Haas grew up in Oley, Pennsylvania in a small farming community. She earned an undergraduate degree in Psychology from Albright College in Reading, Pennsylvania and attended Medical School at Jefferson Medical College, followed by residency at Mercy Redding Family Medicine Residency – a Division of UC Davis Residency. Dr. Haas was a National Health Service Corp Scholar and served four years in Underserved areas working at Federally Qualified Health Centers after residency. Dr. Haas is board certified in Family Medicine and has additional interests in Weight Loss Medicine and Women’s Health Care.

Dr. Haas grew up in Pennsylvania and currently enjoys living in the San Francisco Bay Area. In her spare time, she likes to take her furry children Rex and Betty to dog parks or hiking and spends time with family and friends.

Betsy Jacobs, MD
Medical Director Inpatient & Behavioral Health Programs

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Betsy Jacobs, MD has been a hospitalist with John Muir Medical Group since 2006. She was named Medical Director in January, 2018, after serving as Site Lead and Associate Medical Director since 2014. In these roles, she has helped manage John Muir Medical Group's growing hospitalist program, with primary responsibility for recruitment and training of new hospitalists.

Dr. Jacobs received her medical degree from The George Washington University and completed her Internal Medicine residency at California Pacific Medical Center. Prior to becoming a doctor, she had a previous career in Russian military policy, serving the Department of Defense and Department of the Navy.

Richard Kamrath, MD
Medical Director Osteoporosis / Metabolic Nutrition

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Dr. Kamrath is a long standing member of John Muir Medical and is currently the Medical Director for Osteoporosis & Metabolic Nutrition. He is board certified in Internal Medicine, IM/Endocrinology, Diabetes & Metabolism and is a Certified Clinical Densitomitrist.

Dr. Kamrath went to medical school at Baylor College of Medicine, completed his internship/residency at Kern Medical Center and attended UCLA Medical Center to complete his fellowship.

Lowell Kleinman, MD
Medical Director Ambulatory Palliative Care

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Dr. Kleinman has been practicing medicine since 1994. He joined John Muir Medical Group in 2017. Dr. Kleinman grew up in New York. He earned this undergraduate degree in Biology from Hofstra University in Hempstead, NY and attended Medical School at the State University of New York (SUNY) -Brooklyn Medical School, followed by residency at Harbor-UCLA Medical Center. Dr. Kleinman is board certified in Family Medicine, Hospice and Palliative care.

Dr. Kleinman grew up in New York and has lived most of his adult life in California. In his spare time, he likes to hike, fish and spend time with family.

Melanie Lee, MD
Co-Executive Medical Director Inpatient Services

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Dr. Melanie Lee started with John Muir Medical Group in 2002 as a primary care physician in Concord. She transitioned to a full-time hospitalist with John Muir Medical group in 2008. Dr. Lee is currently a Co-Executive Medical Director of the hospitalist group and overseas hospitalist operations. Dr. Lee splits her time between administrative duties and clinical work as a hospitalist at John Muir Medical Center at the Walnut Creek and Concord campuses, as well at San Ramon Regional Medical Center.

Dr. Lee received her undergraduate degree in biology at the University of Pennsylvania in Philadelphia, PA. She earned her medical degree as the University of Medicine and Dentistry of New Jersey (now know as Rutgers University Medical School) in Newark, NJ. Dr. Lee completed internal medicine residency at Thomas Jefferson University hospital in Philadelphia.

Stacy Ly, MD
Medical Director Inpatient Informatics

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Dr Stacy Ly has been a hospitalist with John Muir Medical Group since 2009. She joined the group after completing her Internal Medicine Residency at UC Davis. She served as a hospitalist site lead from 2014-2017. During this time, she also participated in the Collaborative Practice Committee at JMCC. Since implementation of Epic in 2014, she has played a key role in creating standardized note templates through the Epic Task Force, and a later invested time as a member of the Hospital Physician Advisory Group and Clinical Decision Support workgroup. In 2016, she certified as an Epic Physician Builder, and became the Medical Director of Inpatient Informatics in 2017. Additionally, she splits her directorship role and also works for John Muir Health and actively participates in Physician IT, Clinical Steering Committee, and co-chairs the Order Set workgroup.

She is a native of Oakland, CA and is grateful to settle there with her husband and their two children. She is a running enthusiast and enjoys racing in half marathons in the Bay Area. Inevitably, she is also a fan of shopping at farmer's markets and eating at amazing local restaurants in support of her husband who is a chef and restaurateur.

Yashwant Mehta, MD
Medical Director Inpatient Services

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Born and raised in the Bay Area, Dr. Mehta feels it is a privilege to work for John Muir Medical Group over the last 10 years. He grew up in San Jose and attended Bellarmine Prep High School before moving on to UC Berkeley, where he majored in Molecular and Cell Biology and dabbled in journalism for the school’s newspaper.

Pursuing a career in medicine gave Dr. Mehta a wonderful opportunity to experience life outside of the Bay Area, as he went to medical school and public health school at Tulane University in New Orleans. Dr. Mehta completed an internal medicine residency at USC in Los Angeles County and worked as a night doctor in Philadelphia.

Finding a hospitalist job within John Muir Medical Group proved to be a perfect homecoming. He finds it rewarding to work for an excellent health system and live in the same community served. For the last 5 years, Dr. Mehta has had the honor of serving as a Medical Director and enjoys working with a group of amazing hospitalist colleagues.

John Kimberly Morgan, MD
Medical Director Pediatrics

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Dr. Morgan is a Pediatrician and has been practicing since 1982. He joined the John Muir Medical Group in 1986 and has served as the Medical Director of Pediatrics since 2015.

Dr. Morgan received his undergraduate education in biology at the University of Texas at Austin, graduating magna cum laude et Amplere and stayed in Texas to attend medical school at the University of Texas, Southwestern in Dallas. Heading north to the University of Michigan, Mott Children’s Hospital in Ann Arbor, Michigan, Dr. Morgan completed his pediatric internship and completed his at the State University of New York in Syracuse.

Sarah Rahman, MD
Medical Director Informatics

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Dr. Rahman’s interest in Informatics developed during John Muir Health’s transition to the Electronic Health Record (EHR) in 2013. She became an Epic Certified Trainer for Ambulatory providers, Hospital Providers and Surgeons which enabled her to develop a broad understanding of the impact of the EHR. She subsequently gained additional depth of knowledge by becoming an Epic Certified Physician Builder. Some efforts she has been involved with include establishing a secure texting option, working to develop Epic build for the new Residency program, improving build for the Palliative care program, and a general focus on developing effective education and communication around technology. She continues to work on a broad spectrum of issues with individuals, committees, as well as leadership groups to optimize how technology is integrated in our workflows.

Sarah grew up in New York graduating magna cum laude with a Biochemistry major from Barnard College, completed her medical school training at Cornell Medical School which was followed by residency at UCSF/Mt Zion in Internal Medicine. She has been working with John Muir Health since 2003. Her early years at JHM involved Hospitalist work, but she eventually transitioned to outpatient medicine and now currently practices in the Ambulatory clinics.

She has Board Certification by the American Board of Internal Medicine, and the American Board of Preventative Medicine in Clinical Informatics.

Tanvi Raman, MD
Medical Director Inpatient & Home Visit Programs

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Tanvi S. Raman M.D. joined John Muir Medical Group in 2010. She is part of the hospitalist division, which provides exclusive inpatient care at John Muir hospitals in Concord and Walnut Creek as well as San Ramon Regional Medical Center.

Dr. Raman has worked on various process improvement endeavors in the hospital setting, and is involved in transitional care aspect of medicine. She was involved in the launch of the post discharge clinic and recently, the Home Visit primary care program at John Muir health. She has served as a medical director at stone brook convalescent facility to further care for John Muir patients in that setting.

She co-chairs the Transitions of Care committee and serves on the Strategic Planning and Marketing committee at john Muir Health. She was appointed as an associate medical director with John Muir Medical Group in 2015 and Medical Director in 2017. She is also part of the inpatient faculty for the family medicine residency program at John Muir Health.

Dr. Raman is board certified in Internal medicine. She completed an internal medicine residency from San Joaquin General hospital, community hospital for the underserved population in Stockton, A UC Davis affiliated program. Prior to her residency she was involved as an observer in the endocrinology department lab at UC Davis. She received medical school degree with honors, from India.

Delia Salgado-Lejano, MD
Medical Director Compliance - Inpatient Services

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Dr. Salgado-Lejano joined John Muir Medical Group in 2010 and is currently the Medical Director for Compliance – Inpatient Services. Prior to joining John Muir Medical Group, she worked as a hospitalist with Banner Health in Arizona. She earned an undergraduate degree in Chemistry from Manila Central University, Philippines. She then attended Medical School at University of Santo Tomas, Manila Philippines. She completed her Internal Medicine Residency and Chief Residency at the Maricopa Medical Center in Phoenix, AZ.

Dr. Salgado-Lejano is fluent in both English and Tagalog and her interests include cooking and traveling.

Michael Schierman, MD
Medical Director Recruitment

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Dr. Michael Schierman has been working in the San Ramon/Danville area for over 25 years. He and his wife, Suedale, moved to California in 1992 from Calgary, Alberta after completing his Family Medicine Residency at Foothills Hospital, University of Calgary. Dr. Schierman attended the University of Calgary to complete both his undergraduate degree in Psychology and Medical degree, then completed an Internship year at McGill University in Montreal, Quebec.

Dr. Schierman was initially recruited to practice Family Medicine by the San Ramon Medical Center in 1992. He has served in several leadership roles with this institution including Vice Chief of Staff, Secretary Treasurer and Head of Family Medicine. Early in his career, as a member of Hill Physicians, he participated in committee work. As time passed, he became an exclusive member of the Muir Medical Group IPA and served on their Executive Committee as the Vice President and briefly as interim President. Throughout his career with the IPA, he served on a number of IPA and John Muir Health Network committees and represented the IPA on the Network Board.

Dr. Schierman joined John Muir Medical Group in 2012 and is currently the Medical Director for Recruitment and serves on the Compensation committee. Dr. Schierman is also in full-time Family Practice in Danville, CA working with Dr. Christine Chang and Dr. Priya Swamy.

Outside of medicine, he enjoys being a loving husband to Suedale, his wife of 32 years, and also being a great dad to kids, Matt, 20 and Michaela, 18. Musically inclined, Dr. Schierman, plays guitar and enjoys helping Suedale with their church music program. He enjoys getting together with friends, working out and travelling. You may see Dr. Schierman in the Danville July 4^th parade as a "semi-professional" Elvis impersonator.

Caroline Schreiber, MD
Regional Medical Director - East Bay

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Dr. Caroline Schreiber joined John Muir Medical Group in 2018 as Medical Director for the Berkeley Oakland Region. She enjoys the full variety of patients, illnesses and procedures that family medicine offers, particularly pediatrics, adolescent medicine, women’s health and sports medicine.

A third generation physician, Dr. Schreiber completed her undergraduate at Harvard where she received an AB cum laude in Anthropology. She received her medical degree at the University of Michigan in Ann Arbor. Dr. Schreiber completed her Family Medicine training at Sutter Family Medicine Residency in Sacramento, where she served as Chief Resident in her final year and went on to join the faculty, continuing to teach residents.

A native of Oakland, Dr. Schreiber is rooted in the Bay Area. In her free time, Dr. Schreiber enjoys playing soccer, cycling, spending time with her family, and watching the A’s, Warriors and Michigan football.

Tanya Threewitt, MD
Medical Director of Operations - Family Medicine

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Dr. Tanya Threewitt has been working in Concord with John Muir Medical Group since 2002, splitting her time between her practice and administrative responsibilities to the group. She currently is the Ambulatory Medical Director of Operations and the daily operations of the clinics in JMMG. Dr. Threewitt has also been heavily involved in Epic, John Muir Medical Groups Electronic Health Record (EHR). In her spare time, she likes to read and travel.

Born and raised in San Jose, California, Dr. Threewitt received an undergraduate degree in psychology from UC Davis. She graduated from Hahnemann Medical School in Philadelphia and completed her Family Medicine residency through UC Davis in Modesto, California at the Stanislaus County Doctor’s Medical Center.

Tricia Yeap, MD
Medical Director Quality & Care Transition / Internal Medicine

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Dr. Yeap joined John Muir Medical Group in 2006. As an internist, Dr. Yeap cares about practicing compassionate high quality, evidence based medicine. As the medical director of Quality and Transitions of Care, Dr. Yeap is interested in helping her colleagues to practice evidence based medicine and in closing the gap of communication between the various care settings, minimizing medical errors, performing case review and providing education. In addition, Dr. Yeap enjoys networking with various specialties to improve the continuum of care for her patients.

Dr. Yeap earned an undergraduate degree in Physiology from the University of California at Davis. She then moved to Philadelphia, Pennsylvania to attend Medical School at Drexel University School of Medicine / Hahnemann University. Traveling back to Northern California, she completed her residency at St. Mary’s Medical Center in San Francisco. Throughout her schooling, Dr. Yeap volunteered at homeless clinics, emergency departments and with the Red Cross as a BCLS certification instructor. Dr. Yeap is board certified Internal Medicine.

In her spare time, Dr. Yeap enjoys teaching piano, photo editing and graphic design, painting and tutoring math. During baseball season, you will find her cheering on the San Francisco Giants.

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