Gene was married to actress Jaqueline Coon from 1968 until his death in 1973.
Gene created the Prime Directive, a regulation against interfering from pre-warp drive civilizations. It has been a staple of Star Trek shows since its conception.
Gene L. Coon created the Klingons for Star Trek. They were first seen in the episode "Errand of Mercy" and have been a major part of Star Trek since their introduction.