William Carr was Professor of History at the University of Sheffield, UK. A former Chairman of the German History Society, Professor Carr authored numerous books on German history, including Hitler: A Study in Personality and Politics (1986) and The Origins of the Wars of German Unification (1991). The 4th edition of his classic textbook, A History of Germany 1815-1990, was published in 1991.David Wetzel is Lecturer at the University of California Berkeley, USA. He is the author of A Duel of Giants: Bismarck, Napoleon III and the Origins of the Franco-Prussian War (2001) and A Duel of Nations: Germany, France, and the Diplomacy of the War of 1870-1871 (2012). He is also the editor of From the Berlin Museum to the Berlin Wall: Essays on the Cultural and Political History of Modern Germany (1996).