Timothy J. Gilfoyle is professor of history at Loyola University Chicago where he teaches American urban and social history.  His research has focused on the development and evolution of 19th-century urban underworld subcultures and informal economies.  He is the author of A Pickpocket’s Tale: The Underworld of Nineteenth-Century New York; City of Eros: New York City, Prostitution, and the Commercialization of Sex, 1790-1920; The Urban Underworld in Late Nineteenth-Century New York: The Autobiography of George Appo; and co-author of The Flash Press: Sporting Men’s Weeklies in the 1840s.  Gilfoyle’s interest in urban planning and public space is reflected in Millennium Park: Creating a Chicago Landmark.