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Kissinger became a full professor in Harvard's Department of Government in 1962. As the director of Harvard's University Summer International Seminar, 1952–69, he brought in nearly 700 young European and Asian scholars, many of whom became high officials in their own country. Kissinger met practically every intellectual in international relations at home and abroad.

Kissinger became a full professor in Harvard's Department of Government in 1962. As the director of Harvard's University Summer International Seminar, 1952–69, he brought in nearly 700 young European and Asian scholars, many of whom became high officials in their own country. Kissinger met practically every intellectual in international relations at home and abroad.

Kissinger was eager to serve on national commissions. He served as Study Director, Nuclear Weapons and Foreign Policy, for the Council of Foreign Relations from 1955 to 1956; Director of the Special Studies Project for the Rockefeller Brothers Fund from 1956 to 1958; and Director of the Harvard Defense Studies Program from 1958 to 1971. He resigned from Harvard in January 1971 when his two-year leave of absence expired.

Kissinger was eager to serve on national commissions. He served as Study Director, Nuclear Weapons and Foreign Policy, for the [[Council of Foreign Relations]] from 1955 to 1956; Director of the Special Studies Project for the Rockefeller Brothers Fund from 1956 to 1958; and Director of the Harvard Defense Studies Program from 1958 to 1971. He resigned from Harvard in January 1971 when his two-year leave of absence expired.

In 1957 Kissinger published ''Nuclear Weapons and Foreign Policy,'' which proposed a flexible defense posture, including provision for "limited warfare" and the strategic employment of nuclear weapons as an alternative to the doctrine of "massive retaliation" against direct foreign aggression, which dominated military thinking during the mid-1950s. The book brought Kissinger to national attention, and he became an mid-level advisor on security questions under presidents [[Dwight D. Eisenhower]], [[John F. Kennedy]], and [[Lyndon B. Johnson]]; he was foreign policy advisor in [[Nelson Rockefeller]]'s 1968 quest for the Republican party nomination, but Nixon won the nomination and Kissinger switched to the winner.  

In 1957 Kissinger published ''Nuclear Weapons and Foreign Policy,'' which proposed a flexible defense posture, including provision for "limited warfare" and the strategic employment of nuclear weapons as an alternative to the doctrine of "massive retaliation" against direct foreign aggression, which dominated military thinking during the mid-1950s. The book brought Kissinger to national attention, and he became an mid-level advisor on security questions under presidents [[Dwight D. Eisenhower]], [[John F. Kennedy]], and [[Lyndon B. Johnson]]; he was foreign policy advisor in [[Nelson Rockefeller]]'s 1968 quest for the Republican party nomination, but Nixon won the nomination and Kissinger switched to the winner.