Michael R. Marrus is Chancellor Rose and Ray Wolfe Professor of Holocaust Studies and Dean of Graduate Studies at the University of Toronto. He is the author of five books, including, most recently, The Nuremberg War Crimes Trial 1945-46: A Documentary History.Aristide R. Zolberg is University-in-Exile Professor at the Graduate Faculty of the New School for Social Research in New York City and Director of the International Center for Migration, Ethnicity, and Citizenship. He is the author or editor of many books, including Escape from Violence: Conflict and the Refugee Crisis in the Developing World.