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- He served as Ambassador to the Conference on Security and Cooperation in Europe from 1980 1983; Ambassador and Head of the United States Delegation to the Negotiations with the Soviet Union on Nuclear and Space Arms in Geneva from 1985 1989; and as Counselor to the United States Department of State from 1987 1989 . He then rejoined the law firm of Fried, Frank, Harris, Shriver, & Jacobson LLP, where he was of counsel.