Boutros Boutros-Ghali

The 93-year-old Egyptian served one five-year term as the head of the U.N. from 1992 to 1996. During his stint as the sixth leader of the United Nations, he oversaw several world crises, including the genocide in Rwanda, the bloody breakup of the former Yugoslavia, and the Battle for Mogadishu that spawned the infamous "Black Hawk Down" incident. In the late 1990s, Boutros-Ghali wrote a book blaming the U.S., specifically the politicking of the Clinton administration, for denying him a second term.