to power in Germany in 1933, he was removed from his post. He relocated to Geneva, Switzerland where he taught international law at the Graduate Institute of International Studies from 1934 to 1940. During this time period, Hans Morgenthau departed from Germany to complete his habilitation dissertation in Geneva, which resulted in his book The Reality of Norms and In Particular the Norms of International Law: Foundations of a Theory of Norms. By remarkable good fortune for Morgenthau, Kelsen had just arrived in Geneva as a professor and he became an adviser for Morgenthau's dissertation. Kelsen was among the strongest critics of Carl Schmitt because Schmitt was advocating for the priority of the political concerns of the state over the adherence by the state to the rule of law. Kelsen and Morgenthau were united against this National Socialist school of political interpretation which down-played the rule of law, and they became lifelong colleagues even after both had emigrated from Europe to take their respective academic positions in the United States. During these years, Kelsen and Morgenthau had both become persona non grata in Germany during the full rise to power of National Socialism. That Kelsen was the principal defender of Morgenthau's Habilitationschrift is recently documented in the translation of Morgenthau's book titled The Concept of the Political. In the introductory essay to the volume, Behr and Rosch indicate that the Geneva faculty under the examiners Walther Burckhardt and Paul Guggenheim were initially quite negative concerning Morgenthau's Habilitationschrift. When Morgenthau had found a Paris publisher for the volume, he asked Kelsen to re-evaluate it. In the words of Behr and Rosch, "Kelsen was the right choice to assess Morgenthau's thesis because not only was he a senior scholar in Staatslehre, but Morgenthau's thesis was also largely a critical examination of Kelsen's legal positivism. Thus, it was Kelsen to whom Morgenthau 'owed his Habilitation in Geneva,' as Kelsen's biographer Rudolf Aladár Métall confirms, and also eventually his subsequent academic career, because Kelsen produced the positive evaluation that convinced the board of examiners to award Morgenthau his Habilitation." In 1934, at the age of 52, he published the first edition of Reine Rechtslehre (Pure Theory of Law). While in Geneva he became more deeply interested in international law. This interest in international law in Kelsen was in reaction largely to the Kellogg–Briand Pact in 1929 and his negative reaction to the vast idealism