John Lewis Gaddis is the Robert A. Lovett Professor of History at Yale University. His previous books include The United States and the Origins of the Cold War; Strategies of Containment; The Long Peace; We Now Know; The Landscape of History; Surprise, Security, and the American Experience; and The Cold War: A New History. Professor Gaddis teaches courses on Cold War history, grand strategy, international studies, and biography; has won two Yale undergraduate teaching awards; was a 2005 recipient of the National Humanities Medal; and is the winner of the 2012 Pulitzer Prize in Biography for George F. Kennan.