The portrait gallery in the United Nations Headquarters, New York shows the seven former general secretaries of the UN. They are, from left to right: Trygve Lie (1946-1952) Dag Hammarskjöld (1953-1961) U Thant (1961-1971) Kurt Waldheim (1972-1981) Javier Perez de Cuellar (1982-1991) Boutros ...