Coast Guard Academy in New London, Connecticut, where he teaches courses in toxicology, biochemistry, microbiology, and the science of terrorism. He teaches courses in UMUC's biosecurity and biodefense program that are focused on agents of bioterrorism and on drugs and vaccines being developed to combat them. His research focuses on two distinct topic areas: vesicants, such as mustard gas, and diabetes. Gray earned a PhD in toxicology from the Pennsylvania State University in 2008.