Formerly: Professor and Chairman, Department of Cardiothoracic Surgery, Stanford University School of Medicine, serving as a member of the faculty since 1993; former Director, Stanford Cardiovascular Institute, Heart-Lung and Lung Transplantation Programs, and Cardiothoracic Transplantation Laboratory. Since 2012, President and Chief Executive Officer, Texas Medical Center. Cardiac surgeon who has focused clinical efforts on acquired cardiac diseases with a special expertise in the surgical treatment of congestive heart failure.