Dr. Hepburn is the Vaccine Development Lead for the Countermeasures Acceleration Group, a partnership formerly known as Operation Warp Speed between the Departments of Health and Human Services and Defense that accelerated development of COVID-19 vaccines. Prior to this, Dr. Hepburn served as Joint Project Lead of Enabling Biotechnologies for the Joint Program Executive Office at CBRN Defense, where he was responsible for establishing a start-to-finish capability to develop vaccines and therapeutic solutions against future biological threats. Dr. Hepburn served 23 years in the United States Army as an infectious diseases physician, retiring as a Colonel. His final assignment was as a Program Manager at DARPA. Dr. Hepburn served on the Research, Development and Acquisitions Directorate at the Defense Health Agency and served as Director of Medical Preparedness on the White House National Security Staff. Prior to deployment, Dr. Hepburn was Clinical Research Director at the U.S. Army Medical Research Institute for Infectious Diseases, leading domestic and international clinical research efforts on biodefense products. Col. Hepburn was also an exchange officer to the U.K. and internal medicine chief of residents at Brooke Army Medical Center at Fort Sam Houston, Texas. He completed his infectious disease fellowship and internal medicine residency training at Brooke Army Medical Center and received his medical degree and undergraduate degree in biomedical engineering from Duke University.