David Gerrold (born January 24, 1944) is an American science fiction screenwriter and novelist known for his script for the popular original Star Trek episode "The Trouble With Tribbles", for creating the Sleestak race on the TV series Land of the Lost, and for his novelette "The Martian Child", which won both Hugo and Nebula awards, and was adapted into a 2007 film starring John Cusack.