American science fiction writer who, as a young freelancer, wrote The Trouble with Tribbles and later wrote two Animated Series episodes.
David Gerrold (born 1944) is an American science fiction screenwriter and novelist. While still in his early twenties he sold The Trouble with Tribbles to the original series, a comedic second-season episode in which a cargo of fast-breeding tribbles overruns a space station and the Enterprise.
For The Animated Series he wrote the sequel More Tribbles, More Troubles and the episode Bem. He also wrote the books The World of Star Trek and The Trouble with Tribbles, and contributed to early development of The Next Generation. His other work includes creating the Sleestaks for Land of the Lost and the novelette The Martian Child, which won the Hugo and Nebula awards.