He was an important 19th century American author and poet. His works, for the most part, didn't become well known until after his mysterious death.
He influenced many later authors and poets.
Some of his most famous horror stories were "The Fall of the House of Usher" and ""The Cask of Amontillado" and "The Tell-tale Heart."
Some of his most famous poems are "The Raven" and "Annabel Lee" and "Ulalume".