John Halpin M.D., MPH is a board-certified occupational medicine physician who currently serves as the medical officer for the Opioid Overdose Epidemiology and Surveillance Team at the National Center for Injury Prevention and Control. In this capacity, Dr. Halpin areas of focus have been in the areas of improving Prescription Drug Monitoring Programs (PDMPs) with a focus on the use of PDMP data for public health surveillance purposes, as well as studying and investigating the rise of overdose deaths attributable to illicitly manufactured fentanyl. Dr. Halpin is a former Navy medical officer, having served with both the Marine Corps and the Submarine service during his eight year naval career. He received his master’s in public health from the University of Illinois-Chicago, his MD degree from Loyola-Stritch School of Medicine, and his undergraduate degree from the University of Notre Dame. Dr. Halpin began his career at CDC in 2007.