David R. Johnson has written extensively on politics and the economics of urban development. He is the author of Policing the Urban Underworld: The Impact of Crime on the Development of the American Police, 1800–1887, American Law Enforcement: A History, The Politics of San Antonio: Community, Progress, and Power, cowritten with John A. Booth and Richard C. Harris, and Illegal Tender: Counterfeiting and the Secret Service in Nineteenth-Century America. Johnson is a professor emeritus at the University of Texas at San Antonio, where he began teaching in 1975. He resides in North Carolina.