Mark Mazower is an award-winning historian and writer, specializing in modern Greece, 20th century Europe and international history. His most recent book, Governing the World, tells the story of the rise of internationalism following the Napoleonic Wars, and how idealistic dreams of world government and global harmony embodied in nascent institutions like the League of Nations and United Nations (UN), met the reality of nationalist mobilization and power politics in an age of increasing cooperation, but enduring conflict.