Diana Wynne Jones (16 August 1934 – 26 March 2011) was an English novelist, poet, academic, literary critic, and short story writer. She principally wrote fantasy and speculative fiction novels for children and young adults. Although usually described as fantasy, some of her work also incorporates science fiction themes and elements of realism. Jones' work often explores themes of time travel and parallel or multiple universes. Some of her better-known works are the Chrestomanci series, the Dalemark series, the three Moving Castle novels, Dark Lord of Derkholm, and The Tough Guide to Fantasyland.