Dr. London has been practicing and teaching Gastroenterology in Allentown since 1980. Although graduating from Cornell University and the University of California at Berkeley with degrees in Engineering, he soon realized his interest in medicine, switched fields, and recieved his degree in medicine from the University of Pennsylvania School of Medicine. His training in Internal Medicine and Gastroenterology was also at the University of Pennsylvania. He is Board Certified in both fields. Although his original research was in the field of esophageal disease, he is interested in and sees patients with all gastrointestinal diseases.