Daniel Ellsberg was born in Chicago in 1931. After graduating from Harvard in 1952 with a B.A. summa cum laude in Economics, he studied for a year at King’s College, Cambridge University, on a Woodrow Wilson Fellowship. Between 1954 and 1957, Ellsberg spent three years in the U.S. Marine Corps, serving as rifle platoon leader, operations officer, and rifle company commander.

From 1957-59 he was a Junior Fellow in the Society of Fellows, Harvard University. He earned his Ph.D. in Economics at Harvard in 1962 with his thesis, Risk, Ambiguity and Decision. His research leading up to this dissertation—in particular his work on what has become known as the “Ellsberg Paradox,” first published in an article entitled Risk, Ambiguity and the Savage Axioms—is widely considered a landmark in decision theory and behavioral economics.

In 1959, Ellsberg became a strategic analyst at the RAND Corporation, and consultant to the Defense Department and the White House, specializing in problems of the command and control of nuclear weapons, nuclear war plans, and crisis decision-making. In 1961 he drafted the guidance from Secretary of Defense Robert McNamara to the Joint Chiefs of Staff on the operational plans for general nuclear war. He was a member of two of the three working groups reporting to the Executive Committee of the National Security Council (EXCOM) during the Cuban Missile Crisis in 1962.

Ellsberg joined the Defense Department in 1964 as Special Assistant to Assistant Secretary of Defense (International Security Affairs) John McNaughton, working on the escalation of the war in Vietnam. He transferred to the State Department in 1965 to serve two years at the U.S. Embassy in Saigon, evaluating pacification in the field.

On return to the RAND Corporation in 1967, Ellsberg worked on the top secret McNamara study of U.S. Decision-making in Vietnam, 1945-68, which later came to be known as the Pentagon Papers. In 1969, he photocopied the 7,000 page study and gave it to the Senate Foreign Relations Committee; in 1971 he gave it to the New York Times, the Washington Post and 17 other newspapers. His trial, on twelve felony counts posing a possible sentence of 115 years, was dismissed in 1973 on grounds of governmental misconduct against him, which led to the convictions of several White House aides and figured in the impeachment proceedings against President Nixon.

Ellsberg is the author of three books: Papers on the War (1971), Secrets: A Memoir of Vietnam and the Pentagon Papers (2002), and Risk, Ambiguity and Decision (2001). In December 2006 he was awarded the 2006 Right Livelihood Award, known as the “Alternative Nobel Prize,” in Stockholm, Sweden, “. . for putting peace and truth first, at considerable personal risk, and dedicating his life to inspiring others to follow his example.”

Daniel Ellsberg lives in Kensington, California with his wife, Patricia Marx Ellsberg. Their son, Michael Ellsberg, is the author of The Power of Eye Contact. His oldest son, Robert Ellsberg, is publisher and editor-in-chief of Orbis Books. His daughter, Mary Ellsberg, is Vice President of Research and Programs at the International Center for Research on Women in Washington, D.C. He has 5 grandchildren.

Since the end of the Vietnam War, Ellsberg has been a lecturer, writer and activist on the dangers of the nuclear era, wrongful U.S. interventions and the urgent need for patriotic whistleblowing.

He is a Senior Fellow of the Nuclear Age Peace Foundation.