Peter C. Enzinger, MD, is the clinical director of the Gastrointestinal Cancer Center at the Dana-Farber Cancer Institute and is an assistant professor of medicine at Harvard Medical School, both in Boston, Massachusetts. Dr Enzinger received his undergraduate and medical degrees from Brown University. He completed his residency in internal medicine at the University of Rochester School of Medicine and Dentistry. Subsequently, he completed a fellowship in medical oncology and hematology at Memorial Sloan-Kettering Cancer Center and Weill Medical College of Cornell University in New York City. Dr Enzinger has published many original articles and reviews in journals such as the New England Journal of Medicine, Annals of Oncology, Annals of Surgery, Cancer, and Seminars of Oncology, and serves as a reviewer for the New England Journal of Medicine and many other medical journals. He is a member of the Dana-Farber/Harvard Cancer Center Scientific Review Committee, a grant reviewer for the FDA and National Comprehensive Cancer Network (NCCN), and a member of the National Cancer Institute–Gastrointestinal Intergroup–Esophago-Gastric Task Force, NCCN Colon/Rectal/Anal Cancers Panel, and American Society of Clinical Oncology Cancer Education Committee.