The first half of the 20th century was an era when individuals could have a huge impact on the course of history—whether for good or bad, argues political scientist Michael Mandelbaum. He recommends the best biographies to read about the eight world leaders who feature in his latest book, The Titans of the Twentieth Century, from Woodrow Wilson (1856-1924) to Mao Zedong (1893-1976).
