The Center for Strategic and International Studies, where Schlesinger was a trustee, confirmed his death.
The onetime University of Virginia economics professor built an impressive national-security resume as defense secretary for Republican presidents Richard Nixon and Gerald Ford and was the nation's first energy secretary under Democratic President Jimmy Carter.
Earlier, he was a top White House budget official, chairman of the Atomic Energy Commission and director of the Central Intelligence Agency - all under Nixon.
Schlesinger was "a remarkable public servant," said former Sen Sam Nunn, a Democrat, who sparred with him as chairman of the Senate Armed Services Committee. "He left an astounding mark on American security and energy policy," CSIS said on its website. "After leaving government, Dr Schlesinger continued to promote a stronger and more prosperous country through his work at many policy institutions, including CSIS."
Becoming defense secretary in 1973 at age 44, Schlesinger was well-liked among military leaders, consulting with them frequently and aggressively lobbying Congress for more money for the armed forces. His pro-interventionist foreign policy also brought him favor with the new-right coalition of the day. He worked to rebuild military morale and revamp nuclear strategy in the turbulent period after the Vietnam War era. He opposed amnesty for draft resisters.
But Schlesinger wasn't gone for long.
He was back in the senior ranks of government roughly two years later, serving first as Carter's energy "czar" and then as the first secretary of the new Energy Department, created amid severe fuel shortages and soaring prices spawned by oil embargoes and tensions with Iran in the 1970s.
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