Student, Brazilian Diplomatic Academy, Rio de Janeiro, 1956—1957. Bachelor in Public Administration, Brazilian School Public Administration, Rio de Janeiro, 1957. Bachelor in Law, Federal Fluminense University, Rio de Janeiro, 1958.
3rd secretary Brazilian Foreign Service, Rome, 1961-1963, 2nd secretary Buenos Aires, 1963-1966, 2nd secretary Permanent Mission to United Nations Geneva, 1966—1968, head communications department Rio de Janeiro, 1968-1970, counselor political affairs Washington, 1970-1974, head personnel department Brasilia, 1975—1979, alternate representative of Brazil Office of Special Republican Brazil for Disarmament Affairs Geneva, 1979-1986, ambassador to Nicaragua Managua, 1986—1991, secretary-general budget control, inspector-general Brasilia, 1991, executive secretary-general, 1991—1992, under-secretary-general, 1992—1993, ambassador to Canada, 1993—1996, ambassador to China, 1996—1999, ambassador to Austria, Slovakia, Slovenia and Croatia, 1999—2002, ambassador-at-large disarmament and non-proliferation Brasilia, 2003—2004. High representative disarmament United Nations, New York City, since 2007. Member Brazilian delegate United Nations General Assembly, New York City, 1969, 70, 71, 79-86.
President Review Conference of Parties to the Treaty Prohibiting the Emplacement of Nuclear Weapons on the Seabed and the Subsoil Thereof, Geneva, 1988, VII Review Conference of the Parties to the Treaty on the Non-proliferation of Nuclear Weapons, New York City, 2005. Chairman board governors International Atomic Energy Agency, 1999-2000.
Lieutenant Rio de Janeiro Navy Reserve, 1953-1955.
Son of Ary de Queiroz and Celuta de Queiroz (B. Cavalcanti) D. Married Maria de Lourdes Macedo Duarte (divorced 1987). Children: Carlos Sergio, Luciana.