David A. Bull, MD, is a professor of surgery and chief of the Division of Cardiothoracic Surgery. He is also the Sarver Heart Center Jack G. Copeland Endowed Chair of Cardiothoracic Surgery and Michael Drummond Distinguished Professor of Cardiovascular and Thoracic Surgery. His specialties include aortic surgery, valvular heart disease, adult congenital heart disease, heart transplantation and mechanical circulatory support.