Del Rey Books is a branch of Ballantine Book, which is owned by Random House. It is a separate imprint established in 1977 under the editorship of author Lester del Rey and his wife Judy-Lynn del Rey. It specializes in science fiction and fantasy books. The Sword of Shannara was the first book published through Del Rey Books and the company has continued to publish all the major Shannara novels. Del Rey has also published major interests like the adult Star Wars novels and the novelisations for the popular video game Halo.