David Wurmser served as special assistant at the State Department to a diplomat that was appointed  U.S. ambassador to the United Nations by what president?
John R. Bolton John Robert Bolton (born November 20, 1948) is an American lawyer and diplomat who has served in several Republican administrations. Bolton served as the U.S. ambassador to the United Nations from August 2005 until December 2006 as a recess appointee by President George W. Bush. He resigned in December 2006, when the recess appointment would have otherwise ended, because he was unlikely to win confirmation from the Senate in which a newly elected Democratic Party majority would be taking control in January 2007.
John H. Morrow John Howard Morrow (February 5, 1910 – January 11, 2000) was an American diplomat. In 1959, President Dwight Eisenhower appointed him the first Ambassador to independent Guinea. He became the first representative of the United States in the United Nations Educational, Scientific and Cultural Organization (UNESCO) during the administration of President John F. Kennedy. At the time, he was one of a small number of African American high-level diplomats.