123 books · Harry Turtledove
For more than forty years, Harry Turtledove has been the acknowledged master of one of science fiction's most durable sub-genres: the tale of alternate history. In the course of an incredibly prolific career, Turtledove has created a host of brilliantly imagined revisionist histories on subjects ranging from the American Civil War to the Byzantine Empire to the Second World War (in which an alien invasion plays an unexpected role.) His work includes standalone novels and multi-volume epics,…