GI Specialists



Harvey J. Mamon, MD

Radiation Oncologist, Brigham and Women’s Hospital
Dana-Farber Cancer Institute
Associate Professor of Radiation Oncology, Harvard Medical School

Dr. Mamon's research activities are focused on optimizing the combination of radiation with systemic therapies including conventional chemotherapy and newer targeted agents in the management of malignancies of the gastrointestinal tract. A parallel interest is the development of new techniques for delivery of radiation therapy and measuring radiation effects on normal tissues. 
Dr. Mamon is interested in expanding his research to include translational projects such as identifying biomarkers as prognostic or predictive factors for the response to treatment, and development of targeted agents to act as radiosensitizers.




Richard Tuli, MD, PhD

Associate Professor of Radiation Oncology
Clinical Director of Radiation Oncology

Co-Medical Director of Pancreas Oncology

Dr. Tuli is an attending radiation oncologist in the Department of Radiation Oncology and a member of the Samuel Oschin Cancer Institute. Dr. Tuli's clinical and research interests are in gastrointestinal (GI) oncology. He is active in developing the multidisciplinary management of GI cancer patients. His research interests include investigating novel radiotherapy techniques to improve outcomes and minimize toxicity, and identifying radiosensitizing agents for treating cancer. Current research is directed toward PARP inhibitors, immunotherapies and other novel drugs in combination with radiation. Dr. Tuli has published over 140 research articles, abstracts and book chapters. His research has appeared in several peer-reviewed journals. His awards include the ASCO Cancer Foundation Merit Award, AACR Scholar-in-Training Award and Hyman Menduke Research Prize. Dr. Tuli is a member of professional organizations including the American Society for Radiation Oncology, the American Society of Clinical Oncology and the American Association for Cancer Research. In addition to presenting his research at numerous national and international conferences, Dr. Tuli serves as a manuscript reviewer for peer-reviewed journals. After earning his medical degree from Jefferson Medical College, he completed his residency in radiation oncology at Johns Hopkins Hospital, where he served as chief resident. Dr. Tuli completed a pre-doctoral fellowship at the National Institutes of Health.