John M. Hagedorn is associate professor of criminal justice and senior research fellow at Great Cities Institute at the University of Illinois, Chicago. He is editor of Gangs in the Global City, co-editor of Female Gangs in America: Essays on Girls, Gangs, and Gender, and author of the highly influential People and Folks: Gangs, Crime, and the Underclass in a Rustbelt City.MacArthur fellow Mike Davis is professor of history at the University of California, Irvine. He is the author of many books, including Planet of Slums, City of Quartz, and Ecology of Fear.