Dr. Mark L. Barr 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 transplan-tation immunology. He is currently Co-Director of the USC Transplantation Institute in the Department of Surgery, Chair of the Department of Surgery Appointments, Promo-tions, and Tenure Committee, and Director of the Cardiothoracic Surgery Medical Stu-dent 4 Clerkship. He has served as Chair of the UNOS Thoracic Transplantation Commit-tee, 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 Secretary of the Department of Health and Human Ser-vices during the 8 years of the Obama administration. He is an author / co-author on more than 150 peer-reviewed publications and book chapters in the fields of cardiotho-racic surgery and heart and lung transplantation, has served on multiple scientific review boards for NIAID, NHLBI, and NCRR of the National Institutes of Health, and was a Deputy Editor of the American Journal of Transplantation for 15 years. He will serve on the Board of Directors of the OPTN / UNOS beginning in 2022.