Thomas R. Cullison is an adjunct fellow at CSIS currently reviewing Department of Defense contributions to U.S. health security in support of the CSIS Commission on Strengthening America’s Health Security. Rear Admiral (Ret.) Thomas R. Cullison has been actively involved in health policy and international health engagement issues since retiring in 2010 following a 38-year career that culminated in service as deputy surgeon general of the Navy. He currently serves as senior advisor to the Uniformed Services University’s Center for Global Health Engagement. Previous military leadership positions included deputy commander, Naval Medical Center Portsmouth; commanding officer, Naval Hospital Camp Lejeune; fleet surgeon, U.S. Pacific Fleet; command surgeon, U.S. Indo-Pacific Command; medical officer of the Marine Corps; commander, Naval Medical Center Portsmouth; and commander, Navy Medicine East.