Hoover Green joined the Department of History & Politics as an assistant professor in September 2012, after completing her PhD in political science at Yale University. Her research concerns the dynamics of violence during armed conflict and the measurement of political violence, particularly wartime sexual violence.

Knowles is a historian of modern cities, technology and public policy–with a particular focus on risk and disaster. His most recent book is The Disaster Experts: Mastering Risk in Modern America (Univ. of Pennsylvania Press, 2011). Knowles serves as the director of the Center for Interdisciplinary Inquiry in the Pennoni Honors College. He is the author/editor of Imagining Philadelphia: Edmund Bacon and the Future of the City (UPenn Press, 2009); and has published articles, essays, and book reviews in The Next American City, Isis, History and Technology, The New York Times, Public Works Management and Policy, Technology and Culture, Business History Review, Enterprise and Society, The Smart Set and Annals of Science.