Stephen Robertson is a Professor in the Department of History and Art History at George Mason University, where from 2013-2019 he served as executive director of the Roy Rosenzweig Center for History and New Media. A historian of the twentieth-century United States, his research and teaching focuses on digital history, legal history, and the history of sexuality. Harlem in Disorder grew from Digital Harlem, a research tool created with colleagues at the University of Sydney that maps the complexity of everyday life in the 1920s. Digital Harlem won the American Historical Association’s inaugural Rosenzweig Prize for Innovation in Digital History and the American Library Association’s ABC-CLIO Digital History Prize in 2010. Robertson is also the author of Crimes against Children: Sexual Violence and Legal Culture in New York City, 1880-1960, and Playing the Numbers: Gambling in Harlem Between the Wars, co-authored with Shane White, Stephen Garton and Graham White.