Peter H.R. Green, M.D., is the director of the Celiac Disease Center at Columbia University. He is a professor of clinical medicine at the College of Physicians and Surgeons, Columbia University, and attending physician at the Columbia University Medical Center (New York–Presbyterian Hospital). Celiac disease has been his focus for almost twenty years, with equal concentration on patient care and research. He is one of the few physicians in the United States with an intense clinical and academic interest and expertise in celiac disease.