Mark Lewis, MD, is Director of Gastrointestinal Oncology, Intermountain Healthcare. As a medical oncologist, Dr. Lewis specializes in cancers of the gastrointestinal tract and accessory organs. He has interests in young-onset cancers and hereditary cancer syndromes, shared decision-making, and patient-physician communication. As part of his clinical research activities, Dr. Lewis is active in the SWOG Cancer Research Network, a clinical trials cooperative group created by the National Cancer Institute; within SWOG he chairs the Adolescent and Young Adult (AYA) Oncology. A published researcher, Dr. Lewis has also served as a reviewer for multiple peer-reviewed journals. After attending Baylor College of Medicine, where he also served as resident and chief resident, Dr. Lewis completed a fellowship at Mayo Clinic. Dr. Lewis is Vice President of American Multiple Endocrine Neoplasia Support, serves on the communications committee for the North American Neuroendocrine Tumor Society, and is an active member of the American Society of Clinical Oncology.