William Arthur Carr was an American athlete and double Olympic champion in 1932. Called the "Arkansas flyer," Carr never lost a race during his college and Olympic career. Bill Carr (United States) set the men's 400 m world record of 46.2 in Los Angeles, USA on August 5, 1932. It stood 3.9 years, until Archie Williams's 46.1 on June 19, 1936. Wiki link