In 1957 he came to the United States, where he taught at several schools, including the University of Massachusetts Lowell.

Between books, she taught writing at several universities, including the University of Georgia and Yale.

Matthews taught at several universities, including the University of North Carolina, before joining the University of Washington's political science department in 1976.

He previously taught at several universities, including the University of Baltimore.

After retiring from Dennison in 1949, he taught at Wheaton College and several other universities including the University of Colorado.

He also taught at several universities, including the University of Chicago, from 1946 to 1952, and Columbia University, from 1955 to 1970, when he retired.

During the 1960s he taught at various universities, including Columbia, Princeton, and the University of Houston.

From the 1960s on he taught at various universities in the United States including the University of Chicago.

Zavala taught in many universities in the United States, including the University of Minnesota.

A former lecturer since 1983 he taught mathematics and statistics part-time at a number of universities, including the University of Saskatchewan.