Andrew Preston is a Senior Lecturer in American History and a Fellow of Clare College at Cambridge University.  He has previously taught History and International Studies at Yale University; the University of Victoria, Canada; and the Graduate Institute of International and Development Studies, Geneva.  In addition to several journal articles and book chapters, he is the author of The War Council: McGeorge Bundy, the NSC, and Vietnam (Harvard University Press, 2006) and co-editor, with Fredrik Logevall, of Nixon in the World: American Foreign Relations, 1969-1977 (Oxford University Press, 2008).  His most recent book is Sword of the Spirit, Shield of Faith: Religion in American War and Diplomacy (Knopf, 2012).