Howard Phillips Lovecraft — known as H. P. Lovecraft — was an American author of horror, fantasy, poetry and science fiction, especially the subgenre known as weird fiction.
Lovecraft's guiding aesthetic and philosophical principle was what he termed "cosmicism" or "cosmic horror", the idea that life is incomprehensible to human minds and that the universe is fundamentally inimical to the interests of humankind. As such, his stories express a profound indifference to human beliefs and affairs. Lovecraft is the originator of the Cthulhu Mythos story cycle and the Necronomicon, a fictional magical textbook of rites and forbidden lore.
Although Lovecraft's readership was limited during his lifetime, his reputation has grown over the decades, and he is now regarded as one of the most influential horror writers of the 20th century. According to Joyce Carol Oates, an award-winning author, Lovecraft—as with Edgar Allan Poe in the 19th century—has exerted "an incalculable influence on succeeding generations of writers of horror fiction".