Daniel Francis Galouye (11 February 1920 – 7 September 1976) was an American science fiction writer. During the 1950s and 1960s, he contributed novelettes and short stories to various digest size science fiction magazines, sometimes writing under the pseudonym Louis G. Daniels. Galouye's first published fiction, the novelette Rebirth, appeared in the March 1952 issue of Imagination. His work appeared in many magazines during this era including Galaxy Science Fiction and The Magazine of Fantasy & Science Fiction. Between 1961 and 1973, Galouye wrote five novels, notably Simulacron Three, basis of the movie The Thirteenth Floor (1999) and the German TV miniseries World on a Wire (1973) (directed by Rainer Werner Fassbinder). His first novel, Dark Universe (1961) was nominated for a Hugo. From Wikipedia.