Gerald Allan Sohl Sr. (December 2, 1913 – November 4, 2002) was an American television scriptwriter and science fiction author who wrote for The Twilight Zone (as a ghostwriter for Charles Beaumont), Alfred Hitchcock Presents, The Outer Limits, Star Trek: The Original Series (once using the pseudonym "Nathan Butler"), and other shows. He wrote more than twenty novels as well as feature film scripts. He also wrote the nonfiction works Underhanded Chess and Underhanded Bridge in 1973.