Mark L. Barr, MD, is Associate Professor of Surgery (with tenure), in the Division of Cardiothoracic Surgery, at the University of Southern California Keck School of Medicine where he is Co-Director of Cardiothoracic Transplantation. He obtained his medical degree from Mount Sinai School of Medicine in New York and completed 10 years of postgraduate residency at New York University and Columbia University, including a 2-year NIH-sponsored research fellowship in transplantation immunobiology.

Dr. Barr has served 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), on the Board of Directors of the ISHLT, the ASTS, and the American Society of Transplantation, and as the Program Chair for the Annual Scientific Meeting of both the ISHLT and the American Transplant Congress. Dr. Barr currently is the Chair of the UNOS Thoracic Transplantation Committee that oversees cardiac and lung transplantation policies and regulations for the OPTN in the US, and is a member of the Advisory Committee on Transplantation under the auspices of the Cabinet Secretary of the Department of Health and Human Services. He has served as a study section member for the NIAID, NHLBI, and NCRR of the National Institutes of Health, and is Deputy Editor of the American Journal of Transplantation. Dr. Barr actively serves on multiple national governmental and professional societies’ scientific review, public policy, and regulatory oversight committees.

Dr. Barr has authored more than 150 peer-reviewed publications and book chapters in the fields of cardiothoracic surgery and heart and lung transplantation. He maintains an active research program, funded by both federal and regional grant support, studying transplant immunology and pulmonary physiology.


  • Mount Sinai School of Medicine, MD, 1981
  • Bellevue Hospital Center, 1981 – 1982
  • Columbia Presbyterian Medical Center, 1984 – 1987
  • Bellevue Hospital Center, 1982 – 1984
  • Columbia Presbyterian Medical Center, 1987 – 1990


Clinical Affiliation
  • USC Care Medical Group

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