Among Northwestern's more notable alumni are U.S. Senator and presidential candidate George McGovern, Nobel Prize–winning economist George J. Stigler, Nobel Prize–winning novelist Saul Bellow, Pulitzer Prize–winning composer and diarist Ned Rorem, the much-decorated composer Howard Hanson, Deputy Prime Minister of Turkey Ali Babacan, the historian and novelist Wilma Dykeman, and the founder of the presidential prayer breakfast Abraham Vereide.