Leonard Freeman was an American television writer and producer who is best remembered as the creator of the CBS series Hawaii Five-O in 1968. The show was remade in 2010. He appeared in a 1953 episode of the TV series The Lone Ranger. Hawaii Five-O ran for twelve seasons, at the time a record for a crime drama. In 1960, he wrote for the series Route 66; in 1962, he produced The Untouchables. In 1967, he produced the Clint Eastwood western film, Hang 'Em High.