Keith Robert Andreassi DeCandido (born April 18, 1969) is an American science fiction and fantasy writer and musician, who works on comic books, novels, role-playing games and video games, including numerous media tie-in books for properties such as Star Trek, Buffy the Vampire Slayer, Doctor Who, Supernatural, Andromeda, Farscape, Leverage, Spider-Man, X-Men, Sleepy Hollow, and Stargate SG-1.