Dr. John Gahagan

Biography

John Gahagan is a Clinical Associate Professor in the Surgery Section specializing in Colorectal Surgery at Stanford University. He joined Stanford in 2019 to build the colorectal surgery practice in the East Bay, specifically at Stanford Tri-Valley Hospital in Pleasanton. His training includes advanced minimally invasive surgical techniques, particularly robotic laparoscopic surgery. Dr. Gahagan is dedicated to patient-centered care and employs a multi-disciplinary approach for treating diseases of the colon, rectum, and anus. His clinical focus encompasses surgical treatments for colon and rectal cancers, inflammatory bowel diseases such as ulcerative colitis and Crohn’s disease, as well as benign conditions of the colon and anorectal areas. He is actively involved in surgical education, serving as the Associate Program Director for the Stanford General Surgery Residency Training Program and Site Director for the Stanford Tri-Valley surgery rotation. Throughout his career, Dr. Gahagan has authored textbook chapters and original articles in peer-reviewed journals and has held various administrative positions within Stanford's medical staff, contributing to quality improvement initiatives and surgical education.

Research Interests

Experience