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Between 1979 and 1991, he served as a judge of the Inter-American Court of Human Rights, including a term as that court's president; from 1989 to 1994, he was a judge on the Inter-American Development Bank's Administrative Tribunal; in 1992 and 1993, he served on the United Nations Truth Commission for El Salvador; and from 1995 to 1999, he was a member of the United Nations Human Rights Committee.