Dec 4 (Reuters) - John Bolton resigned on Monday as the American ambassador to the United Nations. Here are highlights of his career. - Appointed by President George W. Bush as U.S. Ambassador to the United Nations on Aug. 1, 2005, bypassing the normal process of congressional approval after it was blocked by senators unhappy with Bolton's record. - Under Secretary of State for Arms Control and International Security from May 2001 to May 2005, where he worked on nuclear proliferation issues. - Assistant Secretary of State for International Organizations from 1989 to 1993 under President George H.W. Bush, and frequently visited the United Nations before and after Iraq's 1990 invasion of Kuwait. - Assistant Attorney General, U.S. Department of Justice, 1985 to 1989, He had previously held posts at the U.S. Agency for International Development and worked as an attorney at law firms in Washington as well as serving as vice president of the Heritage Foundation, a conservative think tank. - Born in Baltimore on Nov. 20, 1948, Bolton graduated summa cum laude from Yale University and later received his law degree from Yale. - He is married to the former Gretchen Smith, a financial consultant, and has one daughter.