Lewis, M.D., F.A.C.P., F.A.C.G., (born November 23, 1956 in Hartford, Connecticut) is an American board-certified gastroenterologist and Clinical Professor of Medicine at the Mount Sinai School of Medicine.
Lewis is a specialist in the field of gastrointestinal endoscopy and was the primary investigator for the first clinical trial of capsule endoscopy for the small intestine and also the first clinical trial of capsule endoscopy for the colon.