L. Sprague deCamp

Harold Shea Stories — (1940-1995) light fantasy co-authored with Fletcher Pratt.
The Compleat Enchanter contains the original Harold Shea stories written by deCamp and Pratt. The Mathematics of Magic, published in 2007, contains the originals plus the later (1990s) stories written by deCamp after Pratt's death. YOU DON'T NEED BOTH BOOKS.   Publisher: Harold Shea is a psychologist who dreams of adventure, but never gets beyond learning to fence and occasionally showing up at staff meetings dressed in horseback riding garb. But when he learns that his boss, Dr. Reed Chalmers, has developed a theory which allows a person to transport himself to any world he can imagine, Harold Shea decides to give it a whirl. This volume includes all the De Camp and Pratt Enchanter stories.

The Incorporated Knight & The Pixilated Peeress — (1987-1991) Library Journal: As knighthood's flower begins to wilt, Eudoric Dambertson sets out on a series of misadventures in search of an ever-elusive title. This collection of connected stories, some of them previously published, features a doughty and resourceful hero and a generous dollop of the de Camps' boisterous humor.