Edgar Allan Poe's impact on American literature was considerable, though his reputation since his death has fluctuated somewhat, and his poetry in particular tends to divide critics. He was one of the first internationally respected American literary critics, or, for that matter, writers. He is also credited with popularizing the detective novel, an immensely popular genre in the United States and elsewhere. No less a figure in that genre than Arthur Conan Doyle credited him with having "breathed the breath of life" into detective fiction. Poe was among the earliest and best authors to work in the genre of the short story, and some even point to Poe as a founding father of science fiction.