After earning a Ph.D. in mathematics at Princeton University in 1955, he became a professor of mathematics and statistics at the University of Chicago in 1968, where he served as department chair from 1980 to 1983 and retired in 1994.
He became a professor of mathematics and statistics at the University of Chicago in 1968. He was earning a Ph.D. in mathematics at Princeton University in 1955. He served as department chair from 1980 to 1983. He retired in 1994.