Dr. Mark A. Lewis is the director of gastrointestinal oncology at Intermountain Healthcare in Utah. He 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, he returned to Houston to work at the MD Anderson Cancer Center for four years, with a dual appointment in general & gastrointestinal medical oncology. He is also the co-chair of adolescent & young adult (AYA) oncology in the SWOG cooperative group, currently serving a five-year term in that position.

During his training he self-diagnosed with multiple endocrine neoplasia type 1 (MEN1) and thus has a particular & deeply personal interest in hereditary tumor syndromes. Additionally, he is passionate about advocacy & research for GI cancer, social media in oncology, and patient-clinician communication.