"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".
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.
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".
Room For Love is a chick lit novel by American author Andrea Meyer.
 The book was inspired by an article the author wrote for the "New York Post" and brings together two New York City obsessions: love and real estate.
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).
Miracles from Heaven: A Little Girl, Her Journey to Heaven, and Her Amazing Story of Healing is a memoir written by an American author Christy Beam, released on April 14, 2015.
 The author wrote the book about her own sick daughter Annabel Beam.
Sin Pit is a crime novel by American journalist Paul S. Meskil (Jul 2, 1923–Oct 11, 2005), published by Lion Books in 1954.
 It is one of those rare paperback originals that has achieved cult status through a combination of circumstances, including the fact the author wrote only one work of crime fiction, the initial print run was relatively low for paperbacks at the time, the book had only one print run by the original publisher (Lion Books) and, finally, found an audience years later among collectors of 1950s paperback crime novels.
 Sin Pit shares all the above circumstances with another paperback crime novel published a year earlier, in 1953, that similarly achieved cult status — Black Wings Has My Angel by Elliott Chaze, published by Fawcett Gold Medal.
 Both authors were respected journalists their entire lives and wrote only a single crime novel that was never republished until years later, only after gaining an audience among aficionados of pulp fiction.
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.
Roverandom is a novella by J.R.R. Tolkien, originally told in 1925, about the adventures of a young dog, Rover.
 In the story, an irritable wizard turns Rover into a toy, and Rover goes to the moon and under the sea in order to find the wizard again to turn him back into a normal-sized dog.
 The author wrote "Roverandom" for his son Michael to amuse him upon the loss of his favorite toy, a little leaden dog which he lost on a beach of grey shingle stones the same size and colour as the toy.
 The work is in tone a children's story, but contains many allusions and references in the manner of "Farmer Giles of Ham".
 "Roverandom" was included in the collection "Tales from the Perilous Realm" from its 2009 reprinting onwards.
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.

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