Question: Which American author wrote "The Colour Out of Space" and "The Call of Cthulhu"?

full_context: Document 1: Grey alien: Grey aliens, also referred to as "Alien Greys", "Greys", "Grays" and "Roswell Greys", are supposed extraterrestrial beings whose existence is discussed in ufological, paranormal, and New Age communities, and who are named for their unique skin color. Forty-three percent of all reported alien encounters in the United States describe Grey aliens. Such claims vary in every respect including their nature, origins (ETs, extradimensionals, time travelers, or machines), moral dispositions, intentions, and physical appearances (even varying in their eponymous skin color). A composite description derived from overlap in claims would have Greys as small-bodied beings with smooth grey-colored skin, enlarged hairless head and large black eyes.
Document 2: The Whisperer in Darkness: The Whisperer in Darkness is a 26,000-word novella by American writer H. P. Lovecraft. Written February–September 1930, it was first published in "Weird Tales", August 1931. Similar to "The Colour Out of Space" (1927), it is a blend of horror and science fiction. Although it makes numerous references to the Cthulhu Mythos, the story is not a central part of the mythos, but reflects a shift in Lovecraft's writing at this time towards science fiction. The story also introduces the Mi-go, an extraterrestrial race of fungoid creatures.
Document 3: Cthulhu Mythos: The Cthulhu Mythos is a shared fictional universe, based on the work of American horror writer H. P. Lovecraft. The term was coined by August Derleth, a contemporary correspondent and protégé of Lovecraft's, to identify the settings, tropes, and lore employed by Lovecraft and his literary successors. The name "Cthulhu" derives from the central creature in Lovecraft's seminal short story, "The Call of Cthulhu", first published in the pulp magazine "Weird Tales" in 1926. Richard L. Tierney, a writer who also wrote "Mythos" tales, later applied the term "Derleth Mythos" to distinguish Lovecraft's works from Derleth's later stories, which modify key tenets of the "Mythos". Authors of Lovecraftian horror in particular frequently use elements of the Cthulhu Mythos.
Document 4: Colour out of space (species): A colour out of space is a fictional extraterrestrial in the writings of the horror fiction author H. P. Lovecraft. It appeared in Lovecraft's short story "The Colour Out of Space" (1927).
Document 5: Elder Thing: The Elder Things (also known as the Old Ones and Elder Ones) are fictional extraterrestrials in the Cthulhu Mythos. The beings first appeared in H. P. Lovecraft's novella, "At the Mountains of Madness" (published in 1936, but written in 1931), and later appeared, although not named, in the short story "The Dreams in the Witch-House" (1933). Additional references to the Elder Things appear in Lovecraft's short story "The Shadow Out of Time" (1936).
Document 6: Lovecraftian horror: Lovecraftian horror is a subgenre of horror fiction that emphasizes the cosmic horror of the unknown (and in some cases, unknowable) more than gore or other elements of shock, though these may still be present. It is named after American author H. P. Lovecraft (1890–1937), who is largely credited as the first author to pioneer the genre.
Document 7: The Call of Cthulhu and Other Weird Stories: The Call of Cthulhu and Other Weird Stories is Penguin Classics' first omnibus edition of works by seminal 20th-century American author H. P. Lovecraft. It was released in October 1999 and is still in print. The volume is named for the Lovecraft short story, "The Call of Cthulhu".
Document 8: H. P. Lovecraft: Against the World, Against Life: H. P. Lovecraft: Against the World, Against Life (French: "H. P. Lovecraft : Contre le monde, contre la vie" ) is a work of literary criticism by French author Michel Houellebecq regarding the works of H. P. Lovecraft. The English-language edition for the American and UK market was translated by Dorna Khazeni and features an introduction by American novelist Stephen King. In some editions the book also includes two of Lovecraft's best known short stories: "The Call of Cthulhu" and "The Whisperer in Darkness."
Document 9: UFOs in fiction: Many works of fiction have featured UFOs. In most cases, as the fictional story progresses, the Earth is being invaded by hostile alien forces from outer space, usually from Mars, as depicted in early science fiction, or the people are being destroyed by alien forces, as depicted in the film "Independence Day". Some fictional UFO encounters may be based on real UFO reports, such as "Night Skies". "Night Skies" is based on the 1997 Phoenix UFO Incident.
Document 10: Edgar Allan Poe: Edgar Allan Poe ( ; born Edgar Poe; January 19, 1809 – October 7, 1849) was an American writer, editor, and literary critic. Poe is best known for his poetry and short stories, particularly his tales of mystery and the macabre. He is widely regarded as a central figure of Romanticism in the United States and American literature as a whole, and he was one of the country's earliest practitioners of the short story. Poe is generally considered the inventor of the detective fiction genre and is further credited with contributing to the emerging genre of science fiction. He was the first well-known American writer to try to earn a living through writing alone, resulting in a financially difficult life and career.
Document 11: Edgar Allan Poe: Edgar Allan Poe ( ; born Edgar Poe; January 19, 1809 – October 7, 1849) was an American writer, editor, and literary critic. Poe is best known for his poetry and short stories, particularly his tales of mystery and the macabre. He is widely regarded as a central figure of Romanticism in the United States and American literature as a whole, and he was one of the country's earliest practitioners of the short story. Poe is generally considered the inventor of the detective fiction genre and is further credited with contributing to the emerging genre of science fiction. He was the first well-known American writer to try to earn a living through writing alone, resulting in a financially difficult life and career.
Document 12: The Haunter of the Dark: "The Haunter of the Dark" is a horror short story by American author H. P. Lovecraft, written in November 1935 and published in the December 1936 edition of "Weird Tales" (Vol. 28, No. 5, p. 538–53). It was the last-written of the author's known works, and is part of the Cthulhu Mythos. The epigraph to the story is the second stanza of Lovecraft's 1917 poem "Nemesis".
Document 13: Cthulhu: Cthulhu ( ; for variant pronunciations, see below) is a cosmic entity created by writer H. P. Lovecraft and first introduced in the short story "The Call of Cthulhu", published in the American pulp magazine "Weird Tales" in 1928. Considered a Great Old One within the pantheon of Lovecraftian cosmic entities, the creature has since been featured in numerous popular culture references. Lovecraft depicts Cthulhu as a gigantic entity worshipped by cultists. Cthulhu's appearance is described as looking like an octopus, a dragon and a caricature of human form. Its name was given to the Lovecraft-inspired universe where it and its fellow entities existed, the Cthulhu Mythos.
Document 14: Cthulhu (disambiguation): Cthulhu is a fictional cosmic entity created by horror author H. P. Lovecraft
Document 15: H. P. Lovecraft: Howard Phillips Lovecraft ( ; August 20, 1890 – March 15, 1937) was an American author who achieved posthumous fame through his influential works of horror fiction. He was virtually unknown and published only in pulp magazines before he died in poverty, but he is now regarded as one of the most significant 20th-century authors in his genre. Lovecraft was born in Providence, Rhode Island, where he spent most of his life. Among his most celebrated tales are "The Call of Cthulhu" and "The Shadow over Innsmouth", both canonical to the Cthulhu Mythos. Lovecraft was never able to support himself from earnings as author and editor. He saw commercial success increasingly elude him in this latter period, partly because he lacked the confidence and drive to promote himself. He subsisted in progressively strained circumstances in his last years; an inheritance was completely spent by the time that he died at age 46.
ground_truth: Howard Phillips Lovecraft