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- Instructor, Spanish, University of Wisconsin, 1936
- Instructor, Spanish, Kansas City (Mo.) Jr. College, 1937
- Associate Professor, Washburn College, 1937-1943
- Assistant Professor, University of Southern California, 1944-1946
- Associate Professor, University of Southern California, 1947-1948
- Professor, University of Southern California, 1949-1960
- Visiting Linguist, 1st National Defense Education Act (NDEA) Institute, University of Colorado, Boulder, 1959
- Professor, University of Colorado, Boulder, 1960-1963
- Professor, Harvard University, 1963-1973
- Emeritus Professor of Romance Languages and Literature, Harvard University, 1973-1992
- Visiting Emeritus Professor of Linguistics, Stanford University, 1978-1992