Barry S. Levy, MD, MPH, is Adjunct Professor of Public Health, Tufts University School of Medicine and a Past President of the American Public Health Association. David H. Wegman, MD, MSc, is Professor Emeritus, Department of Work Environment, University of Massachusetts Lowell, and Adjunct Professor, Harvard T.H. Chan School of Public Health. Sherry L. Baron, MD, MPH, is Professor of Occupational and Environmental Health, Barry Commoner Center for Health and the Environment and the Department of Urban Studies, Queens College of the City University of New York (CUNY), who formerly served with the National Institute for Occupational Safety and Health. Rosemary K. Sokas, MD, MOH is a Professor in the Department of Human Science, School of Nursing and Health Studies, Georgetown University, who formerly served with the Occupational Safety and Health Administration.