Dr. Rexford S. Ahima is professor of medicine at the University of Pennsylvania. He received his BSc training at the University of London, MD at the University of Ghana, and PhD in neuroscience at Tulane University in New Orleans, Louisiana. He received internship and residency training in internal medicine at the Albert Einstein College of Medicine, New York, and clinical and completed research fellowships in endocrinology, diabetes, and metabolism at the Beth Israel Deaconess Medical Center and Harvard Medical School, Boston. Dr. Ahima’s research is focused on the actions of adipose hormones on energy homeostasis, and glucose and lipid metabolism. He is an elected member of the American Society for Clinical Investigation (ASCI) and the Association of American Physicians (AAP), and a fellow of the American College of Physicians (ACP) and The Obesity Society (TOS).