Christian Volk is Professor of Political Theory at the University of Trier, Germany. Since 2011, he is head of the DFG-Research Project “The Concept of Sovereignty in the transnational constellation”. Among his latest books are: Arendtian Constitutionalism. Law, Politics and the Order of Freedom (Oxford, Hart Publishing, forthcoming in 2015); Macht und Widerstand in der globalen Politik (with Julian Junk, Baden-Baden, Nomos Verlag 2013); Ambivalenzen der Ordnung. Der Staat im Denken Hannah Arendts (with Julia Schulze-Wessel and Samuel Salzborn, Berlin, Springer VS-Verlag 2013); Die Ordnung der Freiheit. Recht und Politik im Denken Hannah Arendts (Baden-Baden, Nomos Verlag 2010).