Douglas G. Brinkley is the director of the Theodore Roosevelt Center for American Civilization and Professor of History at Tulane University. He authored the New York Times bestsellers: Tour of Duty: John Kerry and the Vietnam War and Voices of Valor: D-Day; June 6, 1944. He is the official historian for NBC News. Dr. Brinkley is contributing editor for the Los Angeles Times Book Review and American Heritage and a contributor to the New York Times and The New Yorker.