He writes, teaches, and lectures widely on African-American history, medical and public health history, urban history, issues of policing and criminal justice, and the history of social movements. His book, Infectious Fear: Politics, Disease, and the Health Effects of Segregation (UNC Press, 2009), demonstrates the historical and continuing links between legal and de facto segregation and poor health outcomes. Dr. Roberts currently is researching a book project on the history of drug addiction policy and politics from the 1950s to the present.