Watch an interview with Michael Mandelbaum, author of "Titans of the Twentieth Century." Hear why he chose the eight individuals and whether or not any of today's world leaders could be considered "titans." Class discussion follows. Mandelbaum is the Christian A. Herter professor emeritus of American Foreign Policy at the John Hopkins School of Advanced International studies and the author of 17 previous books. You do not need to have read the book.