In addition to Psychopathia Sexualis, he directed Hell's Highway: The True Story of Highway Safety Films, which documented the gruesome "death-on-the-highway" educational films made in the U.S. in the 1960s. Bret is the co-author (with Felicia Feaster) of Forbidden Fruit: The Golden Age of the Exploitation Film, and compiled the books Queen Kelly: The Complete Screenplay by Erich von Stroheim and Marihuana, Motherhood & Madness: Three Screenplays from the Exploitation Cinema of Dwain Esper. His essays have appeared in Sight and Sound, Film Comment, Positif, Video Watchdog, and Filmfax. He produces DVDs for Kino International and is currently finishing special editions of F.W. Murnau's Nosferatu and Robert Wiene's The Hands of Orlac.