When Samantha Power won the 2003 Pulitzer Prize for A Problem from Hell: America and the Age of Genocide, many people wondered what she would write for an encore. Her answer is a groundbreaking biography of Sergio Vieira de Mello. In nearly four decades of work for the United Nations, Sergio distinguished himself as the consummate humanitarian, able to negotiate with-and often charm-cold war military dictators, Marxist jungle radicals, reckless warlords, and nationalist and sectarian militia leaders. …
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