 He was an attorney for the United States Shipping Board from 1919 to 1920.He was a faculty member of Harvard Law School from 1920 to 1939 and again from 1947 to 1959, as an Assistant Professor of Law from 1920 to 1925, Professor of Law from 1925 to 1932, Vice Dean from 1930 to 1939 and as a lecturer from 1947 to 1959.He was general counsel for the National Labor Relations Board from 1934 to 1935.