He then went on to receive a Ph.D. from Yale University in 1951. He was elected to the National Academy of Sciences in 1978, and both the American Philosophical Society and the American Academy of Arts and Sciences in 1981.
In 1951, he obtained a Ph.D. from Yale University. In 1978, he was elected to the National Academy of Sciences, and in 1981, he became a member of both the American Philosophical Society and the American Academy of Arts and Sciences.