He was professor of political science at the
University of Pennsylvania in 1902–1903. He became professor of political science at the
University of Illinois in 1904. He was editor in chief of the
American Journal of Criminal Law and Criminology (1910–1911). He was head of the
American Political Science Association in 1924. In 1928, he lectured at
New York University. In 1929, he lectured at French and English universities as a visiting professor for the
Carnegie Endowment for International Peace. He was awarded Chevalier of the French
Legion of Honour. == Personal life ==