Portrait of Mark L. Barr, MD


University of Southern California 

Associate Professor of Surgery (tenured)

Mark L. Barr, MD is the Co-Director of the USC Transplantation Institute in the Department of Surgery and the Chair of the Department of Surgery Appointments, Promotions, and Tenure Committee at the University of Southern California. He has served as Chair of the UNOS Thoracic Transplantation Committee, as President of the International Society for Heart and Lung Transplantation (ISHLT), as Chair of the Thoracic Committee of the American Society of Transplant Surgeons (ASTS), and on the Board of Directors of the ISHLT, the ASTS, and the American Society of Transplantation. Dr. Barr was the Chair of the Advisory Committee on Transplantation (ACOT) under the auspices of the Cabinet Secretary of the Department of Health and Human Services during the Obama administration. He has served on scientific review boards for NIAID, NHLBI, and NCRR of the National Institutes of Health, and is a past Deputy Editor of the American Journal of Transplantation. Dr. Barr has served on the Board of Directors of the OPTN/UNOS since 2022