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Medical Directors

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Medical Directors

Tanya Threewitt, MD
Executive Medical Director of Operations

Read Dr. Threewitt's bio

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 Executive 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
Executive Medical Director Quality & Care Transition / Internal Medicine

Read Dr. Yeap's bio

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 Executive 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.

Melanie Lee, MD
Executive Medical Director Inpatient Services

Read Dr. Lee's bio

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. 

Yashwant Mehta, MD
Executive Medical Director Inpatient Services

Read Dr. Mehta's bio

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 Executive Medical Director and enjoys working with a group of amazing hospitalist colleagues.

Olawunmi Beckley, MD
Medical Director, Urgent Care Quality and Risk

Read Dr. Beckley's bio

Dr. Beckley received her MD from Temple University and completed residency at University of California at Davis. She competed a Sports medicine fellowship at Thomas Jefferson University/ Rothman Institute and a faculty development fellowship at UCSF whilst faculty at UC Davis. 

She joined John Muir Medical Group as primary care and has worked in urgent care for the past 8 years. She has been a site lead at WC urgent care for the past 5 years and Associate Medical Director for Urgent care for the past 1 year.

Interests outside of medicine include volunteering, music, traveling and family.

Preet Paul Bhambra, MD
Medical Director, Home Visits

Read Dr. Bhambra's bio

Preet Paul Bhambra MD, has been with John Muir Medical Group since 2015. He immigrated from India at a young age, and attended High School in the Bay Area.  After graduating, he attended University of California at Davis, earning a Bachelor of Science in Biochemistry and continued his education at Touro University Medical School in Vallejo, CA.  

Dr. Bhambra completed his residency in Internal Medicine at Arrowhead Regional Medical Center in Southern California, where he continued on as a teaching attending for a year.

Currently, he enjoys teaching residents at the UCSF/Family Medicine Residency Program at John Muir Health.  As Medical Director for the John Muir Health Home Visit Program, Dr. Bhambra enjoys the challenge of optimizing a patients’ health and quality of life in all phases of their medical care.

In his free time, Dr. Bhambra likes cooking, working on cars, and spending time with colleagues and family.  He enjoys learning new skills, mentoring college students, and indulging in new technologies.

Smita Chandra, MD
Medical Director Palliative & Transitional Care

Read Dr. Chandra's bio

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

Read Dr. Chang's bio

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.

Claudine Cho, NP
Medical Director Ambulatory Informatics & Technology

Read Claudine's bio

We are pleased to announce that Claudine Cho, NP who has been with JMMG for five years and is a partner, has accepted the Medical Director Ambulatory Informatics and Technology role effective this month.  Claudine has been involved in the ambulatory informatics committee and the SuperUser group since 2019.  She also has a good understanding of our current EMR system.  She is excited to continue to develop and improve the role of technology in how we deliver quality care.

Claudine Cho has been serving the Tri-Valley community through John Muir as a primary care pediatric nurse practitioner since 2016. Previously, she was with San Ramon Valley Primary Care before acquisition by John Muir. 

Claudine was born and raised in California, growing up in Southern California and moving to the Bay Area in 2012. She graduated from UCLA with a degree in physiologic science, and received her MS in nursing and PNP education from UCSF's MEPN program.  

Outside of work, Claudine enjoys spending time with her husband as they continue to settle in the Tri-Valley community.

Teginder Dhanoa, MD
Medical Director Urgent Care Operations

Read Dr. Dhanoa's bio

Teginder (Jim) Dhanoa MD, joined John Muir Medical Group in 2016.  Dr. Dhanoa first joined JMMG as an Urgent Care physician in Brentwood.  He then went on to serve as Physician Site Lead, Associate Medical Director of Urgent Care, and now serves as Medical Director of Urgent Care Operation since March, 2021.  In addition to his role in Urgent Care, Dr. Dhanoa is a member of the Compensation Committee for John Muir Medical Group.

Dr. Dhanoa is an East Bay native and attended The University of California, Davis.  He served as Chief Resident at the Lutheran Medical Center Family Medicine residency program in Brooklyn, NY and then went on to complete a Sports Medicine fellowship at the University of Michigan, Ann Arbor.

Dr. Dhanoa is a board certified Sports Medicine and Family Physician. 

In his free time, Dr. Dhanoa enjoys spending time with his two kids with whom he shares a passion for travel, hiking, and family time by the pool side.

Rami G. Fasheh, MD
Medical Director of Inpatient Quality

Read Dr. Fasheh's bio

Rami G. Fasheh MD, has been with John Muir Medical Group since 2013. He is a board-certified Family Medicine physician and the Medical Director of Inpatient Quality at John Muir Health where he has served patients and families for the past eight years, receiving the Top Hospitalist award in 2015.

In his practice, Dr. Fasheh is committed to improving the health of his patients and their communities with quality and compassion.  He also teaches medical residents at the UCSF/Family Medicine Residency Program at John Muir Health.

Dr. Fasheh holds a Bachelors’ Degree in Chemistry, minoring in Biology and Mathematics from the University of Louisville and a Medical Degree from the School of Medicine at the University of Dublin, Trinity College.  He completed his Family Medicine Residency at Deaconess Hospital in Evansville, Indiana and a Hospital Medicine fellowship at St. Mary’s Medical Center.  Dr. Fasheh is also an alum of the Alameda County’s Physician Leadership Program.

In his free time, Dr. Fasheh enjoys hiking, traveling, exercise and spending time with family and friends.

Victoria Hsiao, MD
Associate Medical Director Urgent Care

Read Dr. Hsiao's bio

Dr. Victoria Hsiao has been working in the urgent care with John Muir Medical Group since 2014. She served as the physician site lead for the Brentwood UC from 2016-2017 and then as the Medical Director of UC Operations from 2017 – March 2021.  

Originally from Mountain View, CA, Dr. Hsiao received her undergraduate degree in Neurobiology, Physiology and Behavior from UC Davis. She attended Touro University Medical School in Henderson, NV and completed her Family Medicine residency at Chino Valley Medical Center in Chino, CA. 

When away from work, she enjoys spending time with her husband and two young ones at home.

Betsy Jacobs, MD 
Medical Director Inpatient & Behavioral Health Programs

Read Dr. Jacobs' bio

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.

Lowell Kleinman, MD
Medical Director Ambulatory Palliative Care

Read Dr. Kleinman's bio

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.

Stacy Ly, MD 
Medical Director Inpatient Informatics

Read Dr. Ly's bio

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.   

Robin Meezan, MD
Medical Director Pediatrics and Medical Student Coordinator

Read Meezan's bio

Robin Meezan was born and raised in Napa Valley.  She went to college at Stanford University where she received a BA in Human Biology.  Dr Meezan attended the University of Alabama School of Medicine for her MD and completed her pediatric residency at UCSF Benioff Children's Hospital Oakland.   In 2006 she started as a pediatrician in Berkeley, and in 2013 she became a partner with John Muir Medical Group moving her practice to Orinda.  Robin Meezan lives with her husband and two children in Orinda, she enjoys making pottery, cooking projects, tending to her fruit trees, and hiking all around the Bay Area.  

Dr Meezan enjoys building relationships with parents caring for infants all the way through the teenage years.  She has a special interest in helping with sleep and nutrition at all ages.  She is the Medical Director for Pediatrics and the Medical Student Liaison for John Muir Medical Group.

Neeta Milasincic, MD
Medical Director Inpatient Services

Read Dr. Milasincic's bio

Neeta Milasincic MD, FACP, has been with John Muir Medical Group since 2017. She is board-certified in Internal Medicine and is currently the Medical Director of Inpatient Services at John Muir Health.  Dr. Milasincic is practiced Internist with more than 20 years of experience caring for patients as a Hospitalist and Ambulist.  

Dr. Milasincic holds a Bachelor of Science Degree in Electrical Engineering from Baylor University, Waco, Texas, and a Medical Degree from Baylor College of Medicine in Houston, TX.  She completed her residency at Christiana Care Health System in Newark Delaware where she was Chief Medical Resident in her fourth year and went on to act as the Department of Medicine, Consulting Internist and Resident Preceptor for many years.

In addition to teaching, Dr. Milasincic has been an invited lecturer covering topics including infertility, PCOS, endocrinology and nephrology.  Her professional affiliations include American College of Physicians (Fellow) and Society of General Internal Medicine.

Smrutirekha Misra, MD
Medical Director Internal Medicine

Read Dr. Misra's bio

Smrutirekha Misra MD graduated from MKCG Medical College, India and completed her Internal Medicine Residency from Hackensack University Medical Center, a UMDNJ Affiliate, NJ. She is Board Certified in Internal Medicine.

Having lived in 5 states, she calls the Bay Area home now. She was self-employed for 11 of the 20 years that she has served the Tri-Valley Area in the out-patient and in-patient settings. She is on staff at San Ramon Regional Medical Center and has served as Assistant Chief for the Internal Medicine Department. In 2014 her practice was acquired by JMH and she joined JMMG in partnership.

In her spare time she helps support families with special needs, creates culinary fusion style recipes, meditates, loves to read, garden, travel and spend time with friends and family. Her Zen spot is a warm beach!

Bian O'Connor, MD
Medical Director of Inpatient Technology and Innovation Services

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

Read Dr. Salgado-Lejano's bio

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

Read Dr. Schierman's bio

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 4th parade as a "semi-professional" Elvis impersonator.

Caroline Schreiber, MD 
Regional Medical Director - East Bay

Read Dr. Schreiber's bio

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.

Jasleen Sohal, MD
Medical Director Family Medicine

Read Dr. Sohal's bio

Dr. Sohal became Family Medicine Director in April 2021.  She has been a part of John Muir Medical Group since October of 2013.  She joined the group shortly after completing residency in Georgia though Mercer University at the Medical Center of Central Georgia.  She completed her Bachelor’s degree in Communication at Florida Atlantic University, and received her medical degree from Ross University.  Prior to becoming Family Medicine Director, she served as the Associate Medical Director of the central region ambulatory offices.  She has enjoyed teaching medical students during her time with the group.  She has participated in committees such as the Evidence Based Practice Committee. She has also taken opportunities to grow with Informatics joining the superuser program as well as Clinical Decision Support helping modify EHR workflows with clinical input. 

She is originally from south Florida and currently resides in San Ramon with her husband and two children.  In her spare time, she is a music and dance enthusiast taking classes whenever she can.  She also has a fondness for traveling, cooking, and hiking.

Karen Sonnenthal, NP/PA
Director of Nurse Practitioners & Physician's Assistants

Read Karen's bio

Karen L. Sonnenthal has been with John Muir Medical Group since 1997, joining the group after graduating with a Masters in Nursing Science from Oregon Health Sciences University.  

Born in California, Karen grew up in Baltimore Maryland, then moved to Oregon where she attended the University of Oregon and received an undergraduate degree in Biology and Psychology. 

Karen is currently working as a Family Nurse Practitioner, and is the Associate Medical Director for the NP/PA group within John Muir Medical Group.  She is also a member of the Quality and Compensation Committees.

Outside of work she enjoys hiking, gardening and reading as well as spending time with her boys—husband Eric, son Nate, and 2 fur pups Luca and Max.

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