Steven Coughlin, PhD, MPH, is Professor of Epidemiology at the Medical College of Georgia at Augusta University. Dr. Coughlin was Chair of the committee that drafted the ethics guidelines for the American College of Epidemiology, and he served previously as a senior epidemiologist in the Division of Cancer Prevention and Control at the Centers for Disease Control and Prevention (CDC) for more than eleven years. Angus Dawson is Professor of Bioethics and Director of Sydney Health Ethics (SHE) at the University of Sydney. He was previously the first Professor of Public Health Ethics at the Univeristy of Birmingham in the UK.