Les Roberts, Epidemiologist, Johns Hopkins School of Public Health.
"Les Roberts has a Masters degree in public health from Tulane University and a Ph.D. in environmental engineering from Johns Hopkins. He did a post-doctorate fellowship in epidemiology at the Centers for Disease Control and Prevention where he worked for 4 years. In 1994, he worked as an epidemiologist for the World Health Organization in Rwanda during their civil war. Roberts was Director of Health Policy at the International Rescue Committee from Dec. 2000 through March of 2003. He is presently a lecturer at the Johns Hopkins University Department of Geography and Environmental Engineering where he teaches each fall, and teaches at Columbia’s Mailman School of Public Health each winter."