Dr. MacKenzie is the Fred and Julie Soper Professor and chair of the Department of Health Policy and Management of the Johns Hopkins Bloomberg School of Public Health. She is a graduate of the School of Public Health, where she earned Master of Science and doctoral degrees in biostatistics. She joined the Hopkins faculty in 1980 and holds joint appointments in the School's Department of Biostatistics and with the Departments of Emergency Medicine and Physical Medicine and Rehabilitation at the Johns Hopkins University School of Medicine. In addition to her faculty appointments, Dr. MacKenzie served as senior associate dean at the school from 1996 to 2000 and director of the Center for Injury Research and Policy from 1995-2005. Dr. MacKenzie completed a term as chair of the National Advisory Committee for Injury Prevention and Control and is a past president of the American Trauma Society. Dr. MacKenzie's research focuses on the impact of health services and policies on the short- and long-term consequences of traumatic injury. She has contributed to the development and evaluation of tools for measuring both the severity and outcome of injury, which have been used to evaluate the organization, financing and performance of trauma care and rehabilitation. Of particular interest to Dr. MacKenzie is the delineation of factors (both medical and non-medical) that explain variations in functional outcome. Her research has advanced the knowledge of the economic and social impact of injuries and our understanding of how personal and environmental factors influence recovery and return to work. Dr. MacKenzie's ongoing research includes a national evaluation of the cost and effectiveness of trauma care; the evaluation of amputation versus limb salvage in the military; the development and evaluation of self management programs following trauma and limb loss; and efforts to facilitate the development and exchange of information among trauma and EMS providers.