Dr. Bilezikian, the Dorothy L. and Daniel H. Silberberg Professor of Medicine and Professor of Pharmacology at the College of Physicians & Surgeons, Columbia University is Vice Chair of the Department of Medicine for International Education and Research and Chief, Emeritus, of the Division of Endocrinology. He is Director, Emeritus, of the Metabolic Bone Diseases Program at Columbia University Medical Center. Dr. Bilezikian received his undergraduate training at Harvard College and his medical training at the College of Physicians & Surgeons. He completed four years of house staff training (internship, residency and Chief Residency) on the Medical Service at Columbia Presbyterian Medical Center. Dr. Bilezikian received his training in Metabolic Bone Diseases and in Endocrinology at the National Institutes of Health in the Mineral Metabolism Branch under the tutelage of Dr. Gerald Aurbach. He belongs to a number of professional societies including the American Society of Bone and Mineral Research, of which he served as President (ASBMR), 1995-1996 and the International Society of Clinical Densitometry, of which he served as President, 1999-2001.