LOCAL HEALTHCARE PROVIDERS
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19 providers
Availability last updated 11/03/2025
Dr. Yi Zheng, MD
Gastroenterologist
2222 East Street Ste 200
Concord, CA 94520
Ernest Ribera, MD, is a board-certified gastroenterologist with more than 30 years of experience. He heads the team at his private practice, Ernest F. Ribera, M.D. - Burlingame Gastroenterology and Hepatology, in Burlingame, California. His fellowship in Gastroenterology included training at the Naval Medical Center, San Diego, UCSD, and UCSF. He also served as an Adjunct Associate Professor at Stanford University Medical School for over ten years.
Dr. Ribera graduated from the University of Notre Dame and participated in track and cross country. He attended medical school at the College of Human Medicine of Michigan State University. While there, he was awarded the Armed Forces Health Professions scholarship.
Dr. Ribera is currently on the professional staff at Mills-Peninsula Hospitals and has previously served as Chair of the Department of Internal Medicine. He has served as the gastroenterologist for the Samaritan House Clinic since its inception and also supports Operation Access patients. He also served as the Medical Director for Mid-Peninsula Endoscopy Center for six years.
Dr. Ribera is the past president of the Northern California Society for Clinical Gastroenterology. He is also a retired Captain in the Medical Corps of the United States Navy.
Most of the upper endoscopy and colonoscopy procedures performed by Dr. Ribera are done at the Mid-Peninsula Endoscopy Center, which is located on the same floor as his office in Burlingame. This endoscopy center is recognized for quality and safety by the American Society for Gastrointestinal Endoscopy. MPEC is the first endoscopy center in the Bay Area to provide the Medtronic AI technology for colonoscopy.
Dr. Ribera and his wife Maria are the proud parents of four children and four grandchildren.
Dr. Ernest Ribera, MD
Gastroenterologist
1720 El Camino Real
Suite 155
Burlingame, CA 94010
Sara Sameshima is a board-certified Physician Assistant (PA) with experience in Emergency Medicine and now Gastroenterology. Born and raised in Honolulu, Hawaii, Sara left the islands for the University of Southern California(USC) in Los Angeles.
After graduating as a cum laude Renaissance Scholar from USC in 2012, Sara taught English in southern Japan for a year before returning to the states to pursue her career in medicine.
She also has experience working in clinical research with the University of Hawaii Cancer Center studying the relationships between ethnicity, body fat distribution, diet, and cancer risk as well as with allergy & asthma clinical trials.
She graduated from the Keck School of Medicine of USC's PA Program in 2018 after being inducted into the prestigious Pi Alpha Honor Society and joined Dr. Ribera's practice in July 2018.
Sara is passionate about preventative health practices in gastrointestinal health and approaching the patient as a whole to determine the best course of treatment. In her spare time, Sara enjoys traveling, trying new foods, watching USC Trojan football, and exploring the Bay Area with her husband and daughter.
Sara Sameshima
Physician Assistant
1720 El Camino Real
Suite 155
Burlingame, CA 94010
Negar Yaghooti, M.D. is a board-certified gastroenterologist joining the team at Burlingame Gastroenterology and Hepatology. She brings extensive experience from her previous role at Kaiser Permanente, where she specialized in managing patients with complex Crohn’s disease and Ulcerative Colitis.
Dr. Yaghooti grew up in Los Angeles and graduated magna cum laude in Molecular and Cell Biology from UC Berkeley. She earned her medical degree from the University of Maryland. She completed her residency at the University of Southern California and her fellowship at the University of New Mexico. She has received additional training in Inflammatory Bowel Disease at both the University of Chicago and at Cedars Sinai in Los Angeles. She has taken on leadership positions at every step in her career path.
In addition to her advanced training through the Crohn’s and Colitis Foundation and the American Neurogastroenterology and Motility Society, Dr. Yaghooti is passionate about the full spectrum of gastroenterology and hepatology which is consistent with our practice mission. She is committed to providing personalized, patient-centered care, and we are excited to welcome her to our practice
Negar Yaghooti, MD
Gastroenterologist
1720 El Camino Real
Suite 155
Burlingame, CA 94010
Dr. Yi Zheng, MD
Gastroenterologist
2540 East St
Concord, CA 94520
Dr. Yi Zheng, MD
Gastroenterologist
7788 Dublin Blvd
Dublin, CA 94568
Dr. Yi Zheng, MD
Gastroenterologist
4626 Willow Rd
Pleasanton, CA 94588
Sukhwinder Sandhu, MD
Gastroenterologist
734 Mowry Ave
Fremont, CA 94536
Dr. Yi Zheng, MD
Gastroenterologist
87 Fenton St
Livermore, CA 94550
Dr. Yi Zheng, MD
Gastroenterologist
3737 Lone Tree Way
Ste E
Antioch, CA 94509
