Grover Haines Klemmer Jr. was an American sprinter, college football player and coach, and National Football League (NFL) official. At the University of California, he lettered in football, basketball and track. He was called the "golden boy" for the Golden Bears. Grover Klemmer (United States) set the men's 400 m world record of 46.0 in Philadelphia, USA on June 6, 1941. It stood 7 years, until Herb McKenley's 46.0 on June 5, 1948 (equalling it). Wiki link