He joined the department of social sciences at the University of Chicago in 1923 and remained there until 1956, when he became Professor of International Law in the Woodrow Wilson Department of Foreign Affairs at the University of Virginia.
Ia bergabung dengan departemen ilmu pengetahuan sosial di Universitas Chicago pada 1923 dan masih disana sampai 1956, ketika ia menjadi Profesor Hukum Internasional di Departemen Urusan Luar Negeri Woodrow Wilson di Universitas Virginia.