Dr. Chang serves as the Executive Director of UCI Medical Center’s H.H. Chao Comprehensive Digestive Disease Center and as a Professor and Chief of the Division of Gastroenterology at the University of California Irvine. Dr. Chang’s expertise includes developing novel mechanisms for arresting cancer growth, molecular mechanisms of gastrointestinal and esophageal ulcers, gene therapy for treating esophageal and pancreatic cancers, developing new techniques and modalities in interventional endoscopy, and diagnosis and treatment of hepatitis B and C, liver cancer and inflammatory bowel disease.