Barry S. Levy is a physician and epidemiologist who has studied, for more than four decades, the health impacts of occupational and environmental hazards and the adverse consequences of armed conflict. He wrote the book From Horror to Hope: Recognizing and Preventing the Health Impacts of War and co-edited two editions of War and Public Health. He co-edited seven editions of the textbook Occupational and Environmental Health, two editions of Climate Change and Public Health, and ten other books on public health, social justice, and related issues. He has authored or co-authored more than 250 journal articles and book chapters. Dr. Levy formerly served as a medical epidemiologist with the CDC, a professor at the University of Massachusetts Medical School, and a director of international programs and projects. He is an Adjunct Professor in the Department of Public Health and Community Medicine at Tufts University School of Medicine. He has worked in public health in several other countries, including Kenya, Jamaica, China, Thailand, and Hungary. Dr. Levy is a Past President of the American Public Health Association and recipient of APHA’s Sedgwick Memorial Medal. He has served as an expert witness in civil action lawsuits.