To distinguish myself from all the "presidential historians" out there, I have invented a new area of expertise: "presidential crisis historian." How a president confronts the gravest challenges of modern times, and how his decisions affect the rest of us, has been a recurring theme of my seven books.

One Minute to Midnight focused on possibly the gravest crisis ever, in October 1962, when John F. Kennedy stepped back from the nuclear brink at the last possible moment. The Unwanted looked at Franklin Roosevelt's handling of the Jewish refugee crisis that preceded the Holocaust. Six Months in 1945 examined how FDR and Truman negotiated the perilous transition from World War to Cold War. My latest book, King Richard: An American Tragedy, rela