Dr. Calhoon obtained his medical degree at Baylor College of Medicine in Houston, Texas in 1981. He is board certified in Thoracic Surgery and Congenital Cardiac Surgery. He joined the group in 1989 and is professor and founding chair of the Department of Cardiothoracic Surgery.
His current interests include complex congenital heart surgery, heart and lung transplantation, complex adult cardiac surgery, the Ross procedure, less invasive cardiac surgery, and improving education and patient care. Nationally, he has served as President of the TSDA, and Secretary of the STSA.
He is currently president of the TSFRE and past president of the TSDA, a member of the JCTSE Board, an at-large director of the STS, and served as chair of the ABTS. Locally, he has been chairman of the Dominion Country Club, and president of the local AHA affiliate. He is a founder and board member of HeartGift San Antonio, an organization that sponsors charitable lifesaving congenital heart repair on kids from around the globe.