Dr. Mark A. Lewis received his medical degree, completed his internal medicine residency, and served as chief resident at Baylor College of Medicine in Houston, Texas. After completing a hematology/oncology fellowship at the Mayo Clinic in Rochester, Minnesota, where he served as chief fellow, he returned to Houston to work at the MD Anderson Cancer Center for four years, with a dual appointment in general & gastrointestinal medical oncology, before assuming the directorship of gastrointestinal oncology at Intermountain Healthcare in 2016. He is on the Board of Directors of the Neuroendocrine Tumor Research Foundation, Vice President of American Multiple Endocrine Neoplasia Support, and has co-chaired the communications committee for the North American Neuroendocrine Tumor Society.