Steven E. Nissen (born 1948) is an American cardiologist, researcher and patient advocate. He was chairman of cardiovascular medicine at the Cleveland Clinic, in Cleveland, Ohio.Joining Cleveland Clinic in 1992, Nissen served as Vice-Chairman of the Department of Cardiology (1993–2002), Section Head of Clinical Cardiology (1992–2000), and Director of the Coronary Intensive Care Unit (1992–1997). Most recently, he served as Medical Director of the Cleveland Clinic Cardiovascular Coordinating Center (C5), an organization that directs multi-center clinical trials. Nissen still attends in the Cardiac Critical Care Unit periodically throughout the year. Source: Wikipedia (en)