Les Roberts is an associate clinical professor of population and family health at the Mailman School of Public Health at Columbia University. Roberts received his PhD from Johns Hopkins University in 1992. He did a post-doctorate fellowship in epidemiology at the Centers for Disease Control and Prevention. In 1994, he worked as an epidemiologist for the World Health Organization in Rwanda during its civil war. Roberts was director of health policy at the International Rescue Committee from 2000 to 2003. Roberts has led over fifty surveys in seventeen countries, mostly measuring mortality in times of war. In recent years he has taken part in studies to measure mortality in the Democratic Republic of the Congo, Iraq, and Zimbabwe. His present research is focused on developing methods to document the incidence of rape.