Dr Mayer is the faculty vice president for academic affairs at the Dana-Farber Cancer Institute, senior physician at the Brigham and Women's Hospital, physician at the Massachusetts General Hospital, and the Stephen B. Kay Family Professor of Medicine at the Harvard Medical School, where he is also the faculty associate dean for admissions. He has directed the Institute's Medical Oncology Training Program since 1975 and is presently the director of the Hematology/Oncology Fellowship Program of Dana-Farber/Partners CancerCare. Dr Mayer's research interests focus on gastrointestinal cancer, a subject about which he has published extensively. Dr Mayer founded the Center for Gastrointestinal Oncology at the Dana-Farber Cancer Institute and is the past chair of the Gastrointestinal Cancer Committee of the Cancer and Leukemia Group B, a cooperative group sponsored by the National Cancer Institute. He has served as an associate editor for the New England Journal of Medicine, is a past president of the American Society of Clinical Oncology and the Association of Subspecialty Professors, and is a former member of the Executive Committee of the American Board of Internal Medicine. Dr Mayer is a graduate of Williams College and the Harvard Medical School.