Catholic University, 1915-17; United States Army Transportation Corps 1917-19; Notre Dame: history professorship 1919-25, law school professor 1925-52, dean 1941-52: teaching methods, changes in constitutional law, effect of World War II on law schools; speaking tours 1950-52; Chairman Commission on Intergovernmental Relations 1953: states rights, estate taxes, Bricker Amendment; appointment of Ear l Warren to Supreme Court; congressional treaty ratification