Dr. Marcus is a Board Certified Gastroenterologist who has been practicing in Mountain View, California since 1992. He is particularly interested in the early detection and prevention of colon cancer, the diagnosis and management of Crohn’s disease and ulcerative colitis and the endoscopic management of obesity.
Top Doctor in Gastroenterology in San Francisco Bay Area: 2000-2014,Castle Connolly’s America’s Top Doctors
Top Doctor in Gastroenterology: 2013, US News and World Report
Healthgrades Recognized Doctor
Top Doctor in Gastroenterology: 2000-2003 San Jose Magazine
Lisa Cheung Nguyen is a dedicated board-certified Physician Associate (PA-C) who joined Dr. Marcus’s practice in 2024 to help take care of patients suffering from gastrointestinal diseases. She is a graduate of Dominican University of California’s Master of Physician Assistant Sciences program with magna cum laude in 2023. Prior to this, she gained valuable experience as a medical scribe and medical assistant at Stanford, Washington Hospital, and urgent care from 2017 to 2021. She has had an interest in digestive health ever since she was in her teens.
With a strong commitment to patient care and a background in diverse medical settings, Lisa is passionate about improving quality of life and ensuring that patients feel heard and supported. She strongly believes in treating the whole person, as everyone has their own unique story. In addition to her role at Dr. Marcus’s office, Lisa also works at a pain management clinic as a PA.