His studies were interrupted by World War II, during which he was a member of the Statistical Research Group at Columbia. After the war, he would continue his doctoral studies at Stanford, and earned his doctorate in 1950. After serving in the Office of Naval Research from 1948 to 1952, he returned to Columbia as a professor, and taught there from 1952 to 1959.
During World War II, his studies were interrupted when he was part of the Statistical Research Group at Columbia. Post-war, he continued his doctoral work at Stanford and earned his Ph.D. in 1950. After serving with the Office of Naval Research from 1948 to 1952, he returned to Columbia as a professor and taught there from 1952 to 1959.