SAMANTHA POWER: Won Pulitzer Prize for A PROBLEM FROM HELL: AMERICA AND THE AGE OF GENOCIDE, Foreign policy advisor to Barack Obama, her new book is CHASING THE FLAME -- life and death of UN human rights champion, Sergio Vieira de Mello

Her latest book, CHASING THE FLAME is a biography of Sergio Vieira de Mello, the top UN official in Iraq, who died in a truck bombing of the UN's Baghdad headquarters in August 2003. Twenty-one others were killed and dozens wounded in one of the deadliest attacks on the UN in its 58-year history. De Mello had served in the United Nations since 1969 in some of the world's most sensitive areas, including East Timor, Yugoslavia, Cambodia and Bangladesh.