David A. Johnson, M.D.,

David A. Johnson, M.D., F.A.C.G., F.A.C.P., is a professor of medicine and chief of gastroenterology at Eastern Virginia School of Medicine and past president of the American College of Gastroenterology (ACG). He co-founded the National Medicare Carrier Advisory Committee, which he co-chaired for 10 years, and since 2000 has served on both the U.S. Multi-Society Task Force on Colorectal Cancer and the ACG guidelines committee for colorectal cancer screening, co-authoring screening guidelines.