Dr. Calhoun earned his medical degree at Hershey Medical Center, Pennsylvania State University, in Hershey, Pennsylvania. He completed his fellowship in Pulmonary Diseases at the University of Vermont and his fellowship in Allergy – Clinical Immunology at the University of Wisconsin in Madison. He holds a certificate in Medical and Health Care Management from Rice University Jesse Jones School of Business in Houston, Texas.
Dr. Calhoun was a founding member of the US Severe Asthma Research Program, a member of the US Asthma Clinical Research Network, and is an experienced clinical trialist. He served on, and then chaired, the Pulmonary Allergy Drug Advisory Committee for the US FDA, and now serves ad hoc on many FDA Advisory Committees. He was a standing member of the NIH IRAP study section and has served ad hoc on other NIH study sections. He has chaired many NIH study sections in pulmonary diseases. He is a member of the American Thoracic Society and a fellow of the American Academy of Asthma, Allergy, & Immunology (AAAAI), the American College of Asthma, Allergy, and Immunology (ACAAI), the American College of Physicians (ACP), and the American College of Chest Physicians (ACCP).