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Thomas P. Johnston, RRPT, serves as a Health Physicist and Training Manager at the National Institute of Standards and Technology since 2008, specializing in reactor health physics. Johnston has been an editor for the American Journal of Disaster Medicine since June 2005, focusing on radiation safety and health physics in disaster medicine. As a contributing editor for Health Physics News, Johnston produces a column on health physics history through philately. Additionally, Johnston has held various roles, including General Manager at Johnston Tackle Corporation, Radiation Safety Officer at New York Medical College, and Senior Health Physicist at the National Institutes of Health. Johnston holds a Master of Public Health in Epidemiology and a Bachelor of Science in Health Physics, with a career spanning extensive experience in radiation safety and health physics.