Jonathan Hansen is Senior Lecturer on Social Studies at Harvard University. An intellectual historian, he is author of The Lost Promise of Patriotism: Debating American Identity, 1890-1920 (Chicago, 2003) and Guantanamo: An American History (Hill and Wang, 2011), along with articles, opeds, and book reviews on U.S. imperialism, nationalism, cosmopolitanism, and race and ethnicity. He is currently working on a biography of Fidel Castro (YOUNG CASTRO, to be published by Simon & Schuster), which takes him often to Havana and the Oficina de Asuntos Históricos del Consejo de Estado, among other Cuban archives. In recent years, Hansen has taught Social Studies 10 (Introduction to Social Studies), a junior tutorial on "Justice and Reconciliation after Mass Violence," a freshman seminar on PTSD in American history, and (with Robert Mnookin) Harvard Law School seminars on Reconciliation with Cuba and Intractable Conflicts.