John W. Anderson (aka Dr. Sleep), born on November 7, 1956, is a game designer, level designer, and writer. He is probably best known in the Doom community for his Inferno series of maps, originally conceived as a full episode replacement of nine "cantos": The architecture and storyline of the series was inspired by "Inferno" in the epic poem The Divine Comedy by Dante Alighieri, which describes a descent into hell. Several mappers of later generations, such as Samuel "Kaiser" Villarreal and Paul Corfiatis, have cited Dr. Sleep's unique and attractive aesthetic as a basis for their own designs.