Edgar Allan Poe laid the foundations for modern horror through his innovative storytelling techniques and exploration of the psychological aspects of fear. His short stories, such as "The Tell-Tale Heart" and "The Fall of the House of Usher", delve into themes of madness, guilt, and the supernatural. Poe's use of gothic elements and unreliable narrators created a profound sense of unease, influencing the genre of horror literature. He introduced concepts like atmosphere and mood as essential components of storytelling. His works remain staples in literary study, shaping the horror genre for generations to come.