 robert kagan (born september 26, 1958 in athens, greece) is an american historian, author, columnist, and foreign policy commentator at the brookings institution. a co-founder of the project for the new american century, kagan is a senior fellow at the brookings institution and a member of the council on foreign relations. he has been a foreign policy advisor to several u.s. republican presidential candidates as well as to hillary clinton, when she was secretary of state under president obama. ==personal life and education== robert kagan is the son of jewish scholar donald kagan, sterling professor of classics and history at yale university and a specialist in the history of the peloponnesian war. his brother,  frederick, is a military historian and author. all three are signatories to the project for the new american century manifesto titled rebuilding america's defenses (2000).{{cite web |url=http://www.newamericancentury.org/rebuildingamericasdefenses.pdf |title=rebuilding america's defenses: strategy, forces and resources for a new american century
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