This blog explores two broad academic networks and their impact on international politics by probing into the career and writings of the Norwegian jurist and diplomat Edvard Hambro. Both networks developed in close connection to the League of Nations, in the many institutions that surrounded and perforated it, and drove two transformative developments leading into the postwar years: First, the professionalization of foreign policy formation and the transnational process of introducing international relations as an applied academic discipline. Second, the emergence of an autonomous and legitimate field of international law, produced, in large parts, by heterogenic networks of international jurists.