Dr. Parkerson is a board-certified occupational medicine physician licensed to practice in Maryland since 1985. He has nearly 4 decades of experience, with a current solo private practice in occupational medicine. Services include independent medical examinations, disability and retirement evaluations, impairment ratings, Subsequent Injury Fund examinations, return to work/fit duty exams, causation analysis, and case management. He is a fellow in the International Academy of Independent Medical Examiners and the American College of Occupational and Environmental Medicine. As an expert witness, he has provided testimony in Maryland, the District of Columbia, and Delaware, in workers’ compensation and civil venues.

He currently is an Associate faculty member of the Johns Hopkins Bloomberg School of Public Health, and a past associate Director of the Johns Hopkins Center for Occupational and Environmental Health. He directed the case management services for the Maryland Injured Workers' Insurance Fund, and served on the Maryland State Retirement Agency Board. With residency training in general surgery, orthopaedic surgery, and epidemiology and preventive medicine, he has a unique set of clinical skills and experience to address a broad variety of medical conditions.