From "About the Authors" in Logan's Run:

GEORGE CLAYTON JOHNSON has written for such television shows as Star Trek, The Twilight Zone, Route 66, The Law and Mr. Jones, Mr. Novak and Kentucky Jones.  With Ray Bradbury, he scripted Icarus Montgolfier Wright, an animated documentary which was nominated for an Academy Award.  He also wrote the screenplay for the movie Oceans 11, which was based on one of his original stories.  George Clayton Johnson has contributed stories and articles to Playboy, Gamma, Rogue, Connoisseur's World and several underground newspapers, including Open City, which runs his offbeat column, "Iconoclast," as a regular feature.  In great demand as a speaker at science fiction conventions, Mr. Johnson is currently assembling two collections of his best teleplays for future publication.  George Clayton Johnson lives in Pacioma, California.