Mark A. Apfelbaum, MD, is an Associate Clinical Professor of Medicine at Columbia University College of Physicians and Surgeons and Director of NYP System Cath Labs at the Center for Interventional Vascular Therapy at NewYork-Presbyterian Hospital/Columbia University Medical Center, as well as New York Presbyterian/Lawrence Hospital Center.Dr. Apfelbaum received his M.D. degree from Columbia University College of Physicians and Surgeons. He pursued his residency in internal medicine at Columbia Presbyterian, serving as chief resident for the Department of Medicine. He was then a visiting clinical fellow in internal medicine for the Division of Cardiology at Columbia, followed by a visiting clinical fellowship in invasive and interventional cardiology there.Dr. Apfelbaum is a diplomate of the National Board of Medical Examiners, the American Board of Internal Medicine, the Subspecialty Board of Cardiovascular Disease, and the Subspecialty Board of Interventional Cardiology.