Jack Leahy is Professor of Medicine and Chief of the Division of Endocrinology, Diabetes, and Metabolism at the University of Vermont College of Medicine in Burlington. He is Director of the Vermont Regional Diabetes Center and an attending physician at the Medicine Health Care Service, both at Fletcher Allen Health Care/University of Vermont. After earning his medical degree at the Medical College of Virginia in Richmond, Dr Leahy completed an internship, residency, chief residency in medicine, and completed his clinical fellowship in endocrinology and his fellowship in research at the same institution. He is board certified in internal medicine and in endocrinology and metabolism. Dr Leahy has authored and co-authored many book chapters and articles, the latter of which have appeared in such peer-reviewed journals as Diabetes, The Journal of Clinical Investigation, and The New England Journal of Medicine. In addition, he co-edited 2 books regarding clinical care for people with diabetes, and was Editor-in-Chief of Insulin Therapy and Your Practice: Strategies for Improving Patient Outcomes, published by the American Diabetes Association. Dr Leahy’s research interests have included pancreatic ?-cell dysfunction and insulin resistance in diabetes, and he is currently the principal investigator in studies examining the mechanisms of ?-cell compensation and failure.