Peter C. Caldwell is Samuel G. McCann Professor of History at Rice University, USA. Professor Caldwell is a Humboldt Fellow, and has received grants from the DAAD and the Humboldt Foundation, as well as a residential fellowship at the Center for German and European Studies at Georgetown University, USA. He is the author of Popular Sovereignty and the Crisis of German Constitutional Law: The Theory and Practice of Weimar Constitutionalism (1997), Dictatorship, State Planning, and Social Theory in the German Democratic Republic (2003) and Love, Death, and Revolution in Central Europe (2009).