VA/Santa Clara Valley Affiliated Faculty

Affiliated Faculty

Susan Cummings, MDCM

Chief of Gastroenterology
Clinical Professor (affiliated), Stanford University School of Medicine


Dr. Cummings earned her medical degree at McGill University, Montreal in 1979.  She continued at McGill Montreal General Hospital to complete an Internal Medicine Residency in 1982 with board certification in Internal Medicine.  She completed her Gastroenterology fellowship at the University of California, San Diego in 1984 while doing bile acid research. She then pursued advanced training at Yale University, doing research in portal hypertension while involved in an NIH-sponsored clinical investigators program. She is board certified GI.

Dr. Cummings has been working at SCVMC since 1986, embracing our diverse population, outstanding support from the community and staff, cutting edge technology, and great teaching opportunities.  Practicing evidence-based GI with a great group of colleagues and training Stanford fellows has helped foster premier patient care. During Dr. Cummings’ tenure as Chief of GI, the division has doubled in size. Dr. Cummings enjoys general GI and has specialized expertise in biliary disease, including ERCP’s.   


Andrew Ho, MD

Associate Chief of Gastroenterology

Clinical Assistant Professor (affiliated), Stanford University School of Medicine

Dr. Ho received his undergraduate degree from University of California, Los Angeles and earned his medical degree from University of California, San Diego School of Medicine. He subsequently completed his internal medicine residency at the combined Cedars Sinai Medical Center/West Los Angeles Veterans Affairs program and also served an additional year as Chief Medical Resident. He completed his gastroenterology fellowship at the UCLA digestive diseases fellowship program. After completing his gastroenterology fellowship he joined the division of gastroenterology at Santa Clara Valley Medical Center. 

His clinical interests are in inflammatory bowel diseases, specifically ulcerative colitis and Crohn's Disease. He is also interested in hepatology, gastroesophageal reflux disease, celiac disease, gastrointestinal motility disorders, and gastrointestinal bleeding. His research interest have centered on clinical outcomes in inflammatory bowel disease. He is a member of the Crohn's and Colitis Foundation of America, American Gastroenterological Association, American College of Gastroenterology and American Society of Gastrointestinal Endoscopy. Dr. Ho is board certified in internal medicine and gastroenterology.


Elizabeth Hwang, MD

Associate Chief of Gastroenterology

Clinical Assistant Professor (affiliated), Stanford University School of Medicine

Dr. Hwang received her medical degree from the Johns Hopkins University School of Medicine in 2005.  She subsequently completed a residency in internal medicine at Columbia University Medical Center, a fellowship in gastroenterology at Stanford University Medical Center and an additional fellowship in transplant hepatology at Columbia University Medical Center.  She is board certified in Internal Medicine, Gastroenterology and Transplant Hepatology.

Dr. Hwang joined the faculty at Santa Clara Valley Medical Center in 2012.  Her clinical focus is in liver disease, particularly hepatitis B, hepatitis C and cirrhosis; however, she also enjoys practicing general gastroenterology.  Her primary research interest has been in clinical outcomes in hepatitis C treatment.  She is a member of the American Association for the Study of Liver Diseases, American Gastroenterological Association and American Society of Gastrointestinal Endoscopy.  She also serves as the educational coordinator for the Division of Gastroenterology--her goal is to ensure quality mentorship and teaching of Stanford medical students, Santa Clara Valley Medical Center internal medicine residents and Stanford gastroenterology fellows.  She is conversant in Korean and Spanish


Ahmad Kamal, MD, MSc

Associate Chief of Gastroenterology

Vice chair of Internal Medicine

Director of Research Learning Pathway

Clinical Associate Professor (affiliated), Stanford University School of Medicine

Dr. Kamal graduated from the University of California at Irvine in 1995 with a B.S. in Biology and received his M.D. from Harvard Medical School in 1999. He completed his residency in Internal Medicine and fellowship in Gastroenterology at Stanford in 2006, during which time he also earned an MSc in Clinical Epidemiology.

In addition to serving as associate chief of the division of gastroenterology. Dr. Kamal is vice chair of internal medicine and director of the clinical research pathway, an innovative program that provides internal medicine residents mentoring and protected time for clinical research.  He is also an associate professor of medicine (affiliated) at Stanford, and is active in teaching medical students, residents, and fellows. He has also received an outstanding mentor award from Stanford’s biodesign program.

Dr. Kamal has been named a fellow of the American Gastroenterological Association, and been recognized several times in the “Top Doctors” list. Most recently, he was one of 6 recipients of Silicon Valley Business Journal’s Excellence in Healthcare Award. Dr. Kamal has also been active in clinical and health services research, authoring 20 peer-reviewed publications, over 40 abstracts, and 7 book chapters


Suzanne Matsui, MD

Staff Physician, VA Palo Alto Health Care System
Clinical Associate Professor (Affiliated) of Medicine, Stanford University

Dr. Matsui earned her MD from Yale University School of Medicine. She completed her residency in Internal Medicine at Stanford and continued fellowship training at Stanford in Gastroenterology. She studied the molecular biology of gastrointestinal viruses (rotavirus, norovirus and astrovirus) in the laboratory of Dr. Harry Greenberg, under the auspices of VA Career Development Awards and the Physician Scientist Award from the NIDDK. She subsequently joined the Stanford Gastroenterology faculty.

Her career has evolved from basic science researcher to clinical practitioner.  At the VA, she practices general gastroenterology and is privileged to be able to work with Stanford residents in Internal Medicine and General Surgery, and Stanford fellows in Gastroenterology. She also serves as a subspecialty consultant for the War Related Illness and Injury Study Center at the VA Palo Alto, a multidisciplinary translational program, one of three in the nation, for veterans with debilitating health issues related to their deployment.


Jennifer Pan, MD, MS

Staff Physician, VA Palo Alto Health Care System
Clinical Assistant Professor (Affiliated) of Medicine, Stanford University

Dr. Pan graduated from Harvard College and received her medical degree from University of Texas Southwestern. She completed residency in Internal Medicine at Yale-New Haven Hospital and fellowship in Gastroenterology at Stanford, during which she also earned a Master of Science degree in Epidemiology and Clinical Research. She has been at the VA Palo Alto since 2016.

Her clinical and research interests are in GI cancer epidemiology and prevention, hereditary GI cancer syndromes, endoscopy, and healthcare quality improvement. She oversees the colorectal cancer (CRC) screening program for the VA Palo Alto. During her fellowship, she was awarded the ACG International Training Grant, with which she collaborated with Australian researchers to study Lynch syndrome and CRC. She is also interested in education, serving on the Education Advisory Committee for the Stanford GI fellowship program, as well as the AGA Trainee and Early Career Committee Working Group to develop educational programs and opportunities for trainees and early career gastroenterologists.


Susan Quan, MD

Staff Physician, VA Palo Alto Health Care System
Clinical Associate Professor (Affiliated) of Medicine, Stanford University

Dr. Quan received her undergraduate degree at Stanford University. She went on to Johns Hopkins University School of Medicine where she completed her medical degree and residency in Internal Medicine. She returned to Stanford to complete fellowship in Gastroenterology. She is board certified in both Internal Medicine and Gastroenterology.

Dr. Quan has been on faculty at the VA Palo Alto since 2014. She practices general gastroenterology with a primary focus in endoscopy.  During fellowship, she was awarded the APA Young Investigator Award for research in pancreatic diseases. She has published over a dozen peer-reviewed articles and book chapters. She has particular interest in endoscopy techniques and outcomes, healthcare quality improvement, and machine learning-assisted medical applications. Dr. Quan is also active in the Stanford GI fellowship program. She serves on the Clinical Competency and Education Advisory Committees, participates in the fellowship interview and selection process, and co-develops the endoscopy curriculum.


Nimeesh Shah, MD

Associate Chief of Gastroenterology

Clinical Assistant Professor (affiliated), Stanford University School of Medicine

Dr. Shah received his M.D. from the Feinberg School of Medicine at Northwestern University, where he stayed for internal medicine residency. He then completed a gastroenterology fellowship at the University of California, Irvine. He is board certified in gastroenterology.

Dr. Shah joined the SCVMC faculty in 2011, and currently serves as Director of GI endoscopy. He is also a member of the hospital’s sedation committee and the internal medicine residency’s clinical competence committee. He was elected Fellow of the American College of Gastroenterology, and has won numerous teaching awards for his work with medical students, residents, and fellows.


Jason Williams, MD MPH

Associate Chief of Gastroenterology

Clinical Assistant Professor (affiliated), Stanford University School of Medicine

Dr. Williams received his medical degree from Duke University School of Medicine and completed his residency at Stanford University School of Medicine. He completed his fellowship at Oregon Health and Science University and also obtained a Master’s degree in Public Health from the University of North Carolina at Chapel Hill. He is board certified in Gastroenterology.

Dr. Williams joined Santa Clara Valley Medical Center’s Gastroenterology Division in 2011.  He practices general gastroenterology but has specific interests in colon cancer, chronic liver disease, medical informatics, quality improvement within healthcare as well as preventive care. Dr. Williams has several publications within his areas of interest and has presented his research at national meetings. A few of his honors include being selected as a Duke University Scholar, a Duke University Hospital Service Champion Award as well as a Santa Clara Valley Medical Center Customer Service Award.