George Derek Ibbotson was an English runner who excelled in athletics in the 1950s. His most famous achievement was setting a new world record in the mile in 1957. Derek Ibbotson set the men's mile world record of 3:57.2 in London on July 19, 1957. It stood 13 months, until Herb Elliott's 3:54.5 on August 6, 1958. Wiki link