Allister Park is the main character in L. Sprague de Camp's 1940 short work, "The Wheels of If". He appeared again in Harry Turtledove's "The Pugnacious Peacemaker", a sequel to de Camp's work. In "The Wheels of If", Park, a lawyer from New York City, repeatedly finds himself in a series of alternate timelines, before finally coming to rest in a world where, thanks to various changes in the Middle Ages, the Vikings were able to extensively colonize North America.