Assistant hydraulics Technology U., Vienna, 1924-1926. Research assistant United States Bureau Public Rds., Massachusetts Institute Technology, 1926-1932, lecturer, Harvard, 1932-1934, assistant professor, 1934-1940, associate professor, 1940-1946, professor soil mechanics and foundation engineering, 1946-1973, Gordon McKay professor emeritus, from 1973. Consultant numerous federal, state, municipal private engineering orgns. on foundation and earth dams in, United States, Canada, Latin American, Europe, Near and Far Eastern Countries, Africa.
Consultant United States C.E., Panama Canal, Organizer 1st International Conference Soil Mechanics and Foundation Engineering, Cambridge, June 1936.
Fellow Geological Society American, American Association for the Advancement of Science. Member American Academy Arts and Sciences, American Society of Civil Engineers (honorary, Terzaghi lecturer 1964, Edmund Friedman Professional Recognition award 1968), Boston Society Civil Engineers (honorary president 1957-1958), American Society Engineering Education, Transportation Research Board, American Geophysical Union, Mexican Soil Mechanics Society (honorary), Soil Mechanics Society Venezuela (honorary), Japanese Soil Mechanics Society (honorary), Brazilian Association Soil Mechanics (honorary), Society Harvard Engineers and Scientists, International Society Soil Mechanics and Foundation Engineering (president 1961-1965), National Academy Engineering, National Academy Exact, Physical and Natural Sciences Argentina (honorary), Sigma Xi.