Mason Harrell MD

Mason D. Harrell, III, MD, MPH, FACOEM, is a physician with advanced training in preventive medicine, occupational and environmental health, and aerospace medicine. He is triple board certified by the American Board of Preventive Medicine in Occupational Medicine, Public Health & General Preventive Medicine, and Aerospace Medicine. Dr. Harrell earned his medical degree from the Uniformed Services University of the Health Sciences and completed graduate training at the Harvard T.H. Chan School of Public Health, including an occupational and environmental medicine residency and a research fellowship in environmental health. He has served as a U.S. Navy Flight Surgeon and has experience addressing health risks in operational settings. Dr. Harrell’s professional focus includes evaluating occupational and environmental exposures, fitness-for-duty and return-to-work assessments, and advising on workplace and public health risk. He also contributes to physician education as a preceptor, supporting clinicians in residency training. In addition to clinical and advisory work, he has held medical leadership roles, including serving as Chief Medical Officer at WorkCare, Inc., and he co-founded Sequoia Port, Inc., a health technology company aimed at improving medical record review and organization. Dr. Harrell is also involved in nonprofit work supporting research and treatment development for rare genetic conditions.