The Hon. Herbert Henry McKenley OM was a Jamaican track and field sprinter. He competed at the 1948 and 1952 Olympics in six events in total, and won one gold and three silver medals. Herb McKenley (Jamaica) set the men's 400 m world record of 45.9 in Milwaukee, USA on July 2, 1948. It stood 2.1 years, until George Rhoden's 45.8 on August 22, 1950. Wiki link