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.