Randall M. Packard is director of the Institute for the History of Medicine at the Johns Hopkins University. Peter J. Brown is co-director of the Center for Health, Culture and Society at Emory University. Ruth L. Berkelman, is a clinician and professor of epidemiology at the Rollins School of Public Health at Emory University. Howard Frumkin is chair of the Department of Environmental and Occupational Health at the Rollins School of Public Health at Emory University.