Douglas Brinkley, Ph.D., is the fellow in history at the James A. Baker III Institute for Public Policy and a professor of history at Rice University. He is a prominent presidential historian and editor of the recent best seller, "The Reagan Diaries." He is the author of over a dozen books, including "The Unfinished Presidency," "The Boys of Pointe du Hoc," and "The Great Deluge," which won the 2007 Robert F. Kennedy Book Award. He is a contributing editor at Vanity Fair and an in-house historian for CBS News.