Ethel S. Siris, MD, is the Madeline C. Stabile Professor of Clinical Medicine in the Department of Medicine, College of Physicians and Surgeons of Columbia University, and the Director of the Toni Stabile Osteoporosis Center of the Columbia University Medical Center, New York-Presbyterian Hospital, all in New York, New York. She is a graduate of Radcliffe College, Harvard University, and received her medical degree from the College of Physicians and Surgeons of Columbia University. An endocrinologist, she works as a clinician, as a clinical investigator and as a medical educator, all in the area of metabolic bone diseases, including osteoporosis and Paget's disease of bone. In her career she has participated in research activities with bisphosphonates, selective estrogen receptor modulators (SERMS) and RANKL inhibitors. Dr. Siris served as the Medical Director of NORA, the National Osteoporosis Risk Assessment, a public health initiative and longitudinal study of osteoporosis that included over 200,000 postmenopausal women in the US. Most recently her research activity has focused both on risk factors for osteoporosis and treatment adherence with osteoporosis medications. Dr. Siris is the immediate past president of the National Osteoporosis Foundation and currently serves on the Board of Trustees of both the National Osteoporosis Foundation in the US and the International Osteoporosis Foundation. She is also a member and former vice chair of the Board of Directors of the Paget Foundation for Paget's Disease of Bone and Related Disorders. She has previously served on the Council of the American Society for Bone and Mineral Research and on the Endocrinologic and Metabolic Drugs Advisory Committee of the US Food and Drug Administration. She has published widely in the medical literature and is co-editor of the book, The Bone and Mineral Manual. Dr. Siris has been interviewed frequently on both television and radio and is often quoted in print media regarding osteoporosis.