Dr. Jeffrey Mark is a California state licensed medical doctor, specializing in Gastroenterology. Graduated Magna Cum Laude from University of Illinois College of Medicine at Chicago, completed residency training in Evanston Northwestern Hospital, and completed the Gastroenterology specialist training at Chicago Medical School. Dr. Mark currently is working at John Muir Health, located in 111 Deerwood Rd #168 San Ramon CA 94583 Please call +1-925- 736-8228 to contact. Access cdoc101.com on a desktop computer to view more details. | |||