Instructor Johns Hopkins, 1928-1930. Assistant professor Bryn Mawr College, 1930-1939, professor, 1940-1971, department chairman geology, 1930-1971, research associate, 1971-1974. Lecturer La Salle College, 1971.
Geologist United States Geological Survey, Montana, 1927, Maryland. Geological Survey, 1928-1930, Pennsylvania Geological Survey, 1935-1975, University of Michigan Expedition to Mexico, 1930, Atlantic Refining Company, Montana, 1944-1945, Brazilian government Goias, 1954. Leader National Science Foundation conference geology Appalachians, 1960-1967.
Consultant cement rock, metallurgical limestone, water supply.