Gray is a vaccinologist and board-certified infectious disease physician with 30 years of research and development experience, including clinical trial design and execution in the US and overseas. His expertise includes preclinical, first-in-human, and field trials of new drug products in tropical medicine and biodefense. He has held biotechnology leadership positions in government and in the private sector. Prior to Vaxxinity, Dr. Heppner was Chief Medical Officer for Crozet BioPharma, responsible for Nipah and Marburg virus vaccines. Served as Chief Medical Officer for BioProtection Systems, leading clinical and regulatory operations of the Ebola vaccine program. Gray was Snr Scientist at TASC Inc. providing Advisory and Analysis Services to the Defense Threat Reduction Agency. Dr. Heppner’s 23-year Army career culminated as Deputy Commander [COO] of the Walter Reed Army Institute of Research (WRAIR). From 1999-2008, as Chief of Immunology, and then as Director of the Division of Malaria Vaccine Development, he led the Army’s international malaria vaccine program. In partnership with Glaxo SmithKline, he spearheaded development of the RTS,S/AS malaria vaccine. Dr. Heppner has authored or co-authored 113 NLM articles with a Hirsch Index of 61, serves on the National Biodefense Science Board (NBSB/ASPR/DHHS) and is an elected Fellow of the American College of Physicians and the American Society of Tropical Medicine and Hygiene.