George Clayton Johnson was an American science fiction writer most famous for co-writing the novel ''Logan's Run'' with William F. Nolan (basis for the 1976 film "Logan's Run'). He was also known for his work in television, writing screenplays for such noted series as ''The Twilight Zone'', and ''Star Trek''. He also wrote the story on which the 1960 and 2001 films ''Ocean's Eleven'' were based. His work has appeared in numerous anthologies