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.
David L. Osborn David Lawrence Osborn (January 11, 1921 – September 16, 1994) of Tennessee served as Consul General of the United States of America Hong Kong and Macau from August 1970 to March 1974, and as United States Ambassador to Burma from March 1974 to July 1977, immediately following Edwin W. Martin in both positions.