Question: Crouch End is a horror story by Stephen King, originally published in "New Tales of the Cthulhu Mythos" (1980), it contains distinct references to the horror fiction of which American author who achieved posthumous fame through his influential works of horror fiction?

Context paragraphs:
Frank Belknap Long: Frank Belknap Long (April 27, 1901 – January 3, 1994) was an American writer of horror fiction, fantasy, science fiction, poetry, gothic romance, comic books, and non-fiction.  Though his writing career spanned seven decades, he is best known for his horror and science fiction short stories, including early contributions to the Cthulhu Mythos.  During his life, Long received the World Fantasy Award for Life Achievement (at the 1978 World Fantasy Convention), the Bram Stoker Award for Lifetime Achievement (in 1987, from the Horror Writers Association), and the First Fandom Hall of Fame Award (1977).

Gramma (short story): "Gramma" is a short horror story by American author Stephen King.  It was first published in "Weirdbook" magazine in 1984 and collected in King's 1985 collection called "Skeleton Crew".  Certain characters/creatures/unearthly powers featured in the works of H. P. Lovecraft also appear in this story, making it a story set in the Cthulhu Mythos.

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.

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.

Black Man with a Horn: "Black Man with a Horn" is a horror novella by American writer T. E. D. Klein; part of the Cthulhu Mythos cycle, it originally published in "New Tales of the Cthulhu Mythos".  Critic S. T. Joshi notes that the story demonstrates a "deftness of style, a subtlety in the build-up of a horrific climax, and a deep understanding of the psychological effects of horror."

Crouch End (short story): Crouch End is a horror story by Stephen King, originally published in "New Tales of the Cthulhu Mythos" (1980), and republished in a slightly different version in King's "Nightmares & Dreamscapes" collection (1993).  It contains distinct references to the horror fiction of H. P. Lovecraft.

Hyperborean cycle: The Hyperborean cycle is a series of short stories by Clark Ashton Smith that take place in the fictional prehistoric setting of Hyperborea.  Smith's cycle takes cues from his friends, H. P. Lovecraft and Robert E. Howard and their works.  Lovecraft wrote to Smith in a letter dated 3 December 1929: "I must not delay in expressing my well-nigh delirious delight at "The Tale of Satampra Zeiros" [Smith's short story]... [W]hat an atmosphere!  I can see & feel & smell the jungle around immemorial Commoriom, which I am sure must lie buried today in glacial ice near Olathoe, in the Land of Lomar!" .  Soon afterward, Lovecraft included Smith's Tsathoggua (which originally appeared in "The Tale of Satampra Zeiros") in the story "The Mound", ghostwritten for Zelia Reed (Zelia Bishop) in December 1929.  Lovecraft also mentioned Tsathoggua in "The Whisperer in Darkness", which he began on February 24, 1930.  Because Smith in turn borrowed numerous Lovecraftian elements, the cycle itself may be regarded as a branch of the Cthulhu Mythos.  In a letter to August Derleth dated 26 July 1944, Smith wrote: "In common with other weird tales writers, I have ... made a few passing references (often under slightly altered names, such as Iog-Sotot for Yog-Sothoth and Kthulhut for Cthulhu) to some of the Lovecraftian deities.  My Hyperborean tales, it seems to me, with their primordial, prehuman and sometimes premundane background and figures, are the closest to the Cthulhu Mythos, but most of them are written in a vein of grotesque humor that differentiates them vastly.  However, such a tale as "The Coming of the White Worm" might be regarded as a direct contribution to the Mythos." .

Cthulhu Mythos anthology: A Cthulhu Mythos anthology is a type of short story collection that contains stories written in or related to the Cthulhu Mythos genre of horror fiction launched by H. P. Lovecraft.  Such anthologies have helped to define and popularize the genre.

Cthulhu Cultus: Cthulhu Cultus was a small press horror magazine, that was published from 1995 to 2001.  Its total run included 18 issues.  "Cthulhu Cultus" published the works of established horror fiction and noir writers like Joseph S. Pulver and D.F. Lewis, and was devoted to weird, supernatural and horror fiction and poetry with an emphasis on H. P. Lovecraft's Cthulhu Mythos.

Cthugha: Cthugha is a fictional deity in the Cthulhu Mythos genre of horror fiction, the creation of August Derleth.  In Derleth's version of the Cthulhu Mythos, Cthugha is a Great Old One, an elemental spirit of fire opposed to the Elder Gods. Derleth set its homeworld as the star Fomalhaut, which had featured in Lovecraft's poetry.  He first appeared in Derleth's short story "The House on Curwen Street" (1944).

Supporting paragraphs: Crouch End (short story) H. P. Lovecraft
Answer: H. P. Lovecraft