Robert Kagan is an American historian and foreign policy commentator. Robert Kagan is the son of Yale classical historian and author, Donald Kagan. He is married to Victoria Nuland, the former U.S. ambassador to NATO, and has two children. He is the brother of political commentator Frederick Kagan. Kagan is a columnist for the Washington Post and is syndicated by the New York Times Syndicate. He is a contributing editor at both The New Republic and the Weekly Standard, and has also written for the New York Times, Foreign Affairs, the Wall Street Journal, Commentary, World Affairs, and Policy Review.