Walter Greenhalgh, M.D.

Dr. Walter Greenhalgh, MD, is a Family Physician and currently the Deputy Chief Medical Officer with US Customs and Border Protection (CBP), within the Department of Homeland Security (DHS). CBP is the largest agency within DHS, with over 64,000 employees, and in this role he assists the Chief Medical Officer in overseeing a staff of over 50 personnel who engage in CBP workforce health, wellness and resiliency, public health, and health data collection and analysis used in future growth and decision making within the organization. The office also, importantly, oversees a large medical services contract that provides healthcare support to millions of persons crossing the border into the United States.

Prior to this position, Dr. Greenhalgh was a Health Policy Fellow with the Robert Wood Johnson Foundation, sponsored by the National Academy of Medicine, with placement in the office of Senator Ben Cardin, D-Maryland. Important projects he was involved in during his fellowship included addressing growing health and healthcare disparity among the economically underprivileged; recognizing and highlighting the social determinants of health and the use of legacy and novel solutions to improve these among the underserved; maternal in infant mortality and morbidity; Medicare expansion, and the local, regional and national COVID-19 Pandemic response and vaccine development and distribution during the height of the pandemic, 2020 to 2021.

Before his fellowship, Dr. Greenhalgh spent a career as a clinician and leader in the US Navy Medical Corps, with his last posting on active duty serving as the director for the National Intrepid Center of Excellence (NICoE), Walter Reed National Military Medical Center in Bethesda, Maryland. NICoE is a clinical research institute that incorporates interdisciplinary care and state-of-the-art facilities and technologies to study and treat military service members and their families dealing with the complexities of traumatic brain injury (TBI), psychological health concerns, and other associated comorbidities. While its director, Dr. Greenhalgh worked closely with other military services, government, and private organizations and oversaw the development of a network incorporating similar facilities across the country, advancing the desired end state of an integrated practice unit supporting the military TBI pathway of care.

Dr. Greenhalgh served in numerous other roles while in the Navy, providing care and clinical leadership as a department chief, service-line director, and medical staff president at small remote clinics, community hospitals, and medical centers across the United States and overseas. He has also served in the humanitarian and operational settings while deployed overseas and aboard a Navy hospital ship.

Dr. Greenhalgh received his BS in Microbiology and Immunology at McGill University in Montreal, Quebec and earned an MD from Thomas Jefferson University in Philadelphia, Pennsylvania. He followed an internship in general surgery at the National Naval Medical Center, Bethesda Maryland, with a tour as a naval flight surgeon and then completed his residency at the Naval Hospital in Bremerton, Washington. Dr. Greenhalgh also received an MA in national security and strategic studies at the Naval War College in Newport, Rhode Island.