L. Sprague de Camp:

L. Sprague de Camp — was an American writer of science fiction, fantasy, non-fiction and biography. In a career spanning 60 years, he wrote over 100 books, including novels and works of non-fiction, including biographies of other fantasy authors. He was a major figure in science fiction during the genre's heyday in the 'Golden Age’. The Complete Compleat Enchanter is an omnibus collection of five classic fantasy stories by authors L. Sprague de Camp and Fletcher Pratt, this is the first hardcover edition (1989).

The Harold Shea stories are parallel world tales in which universes where magic works coexist with our own, and in which those based on the mythologies, legends, and literary fantasies of our world and can be reached by aligning one's mind to them by a system of symbolic logic. Psychologist Harold Shea and his colleagues Reed Chalmers, Walter Bayard, and Vaclav Polacek (Votsy), travel to several such worlds, joined in the course of their adventures by Belphebe and Florimel of Faerie, who become the wives of Shea and Chalmers, and Pete Brodsky, a policeman who is accidentally swept up into the chaos.

The five stories collected in The Complete Compleat Enchanter explore the worlds of Norse mythology in "The Roaring Trumpet," Edmund Spenser's The Faerie Queene in "The Mathematics of Magic," Ludovico Ariosto's Orlando Furioso (with a brief stop in Samuel Taylor Coleridge's Kubla Khan) in "The Castle of Iron," the Kalevala in "The Wall of Serpents," and Irish mythology in "The Green Magician."