Peter H.R. Green, M.D., is the director of the Celiac Disease Center at Columbia University. He is the Ivan and Phyllis Seidenberg Professor of 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 the last 25 years with equal concentration on patient care and research. He is the co-author of Celiac Disease: A Hidden Epidemic and Gluten Exposed: The Science Behind the Hype and How to Navigate to a Healthy, Symptom-Free Life.