Sydney James Bounds (November 4, 1920 – November 24, 2006) was an English author. He wrote as Sydney J. Bounds and S. J. Bounds, as well as under the pen names Clifford Wallace, James Marshall, Earl Ellison and Rex Marlowe. He wrote over forty novels and hundreds of short stories, many published under pseudonyms or anonymously. He was best known for his  science fiction, but also wrote horror, Westerns, mysteries and juveniles.