Instructor in economics, Rutgers College, 1917-1920. Assistant professor economics, Dartmouth College, 1920-1921. With Princeton University since 1921, assistant professor economics, until 1925, associate professor, 1925-1930, professor since 1930.
Secretary American Commission Financial Advisers to Poland, 1926. Economic adviser to Business Men’s Commision on Agriculture, 1927. Guggenheim fellow, Germany, 1927-1928.
Economic adviser, Federal Farm Board, 1930-1931. Professor of international economics, Institut Universitaire de Hautes Etudes Internationales, Geneva, Switzerland, 1931-1933. Member of the Commission on Cuban Affairs, 1934.
Oberlaender Trust fellow, 1936, Knight Order of Polonia Restituta.
Author: Exchange, Prices and Production in Hyper-Inflation, Germany (1920-1923), 1930. The Abolition of Unemployment, 1932. Protective Tariffs, 1934.
Golden Avalanche (with C. R. Whittlesey), 1939. Social Goals and Economic Institutions, 1942. (with Abba P. Lerner and others) Planning and Paying for Full Employment, 1946.
Also writer on agriculture, money, finance and international trade.