Question: Which writer has his novels take place in a fictional Ozark Mountain town: Brian O'Nolan or Donald Harington?

Documents:
source: Donald Harington (writer)
text: Donald Harington (writer) Donald Douglas Harington (December 22, 1935 – November 7, 2009) was an American author. All but the first of his novels either take place in or have an important connection to "Stay More," a fictional Ozark Mountains town based somewhat on Drakes Creek, Arkansas, where Harington spent summers as a child.

source: Brian O'Nolan
text: Brian O'Nolan Brian O'Nolan (Irish: "Brian Ó Nualláin" ; 5 October 1911 – 1 April 1966) was an Irish novelist, playwright and satirist, considered a major figure in twentieth century Irish literature. Born in Strabane, County Tyrone, he is regarded as a key figure in postmodern literature. His English language novels, such as "At Swim-Two-Birds", and "The Third Policeman", were written under the "pen name" Flann O'Brien. His many satirical columns in "The Irish Times" and an Irish language novel "An Béal Bocht" were written under the name Myles na gCopaleen.

source: The Pitcher Shower
text: The Pitcher Shower The Pitcher Shower (2005) is a novel by Donald Harington set in the Arkansas part of the Ozarks in fictional towns near the fictional town of Stay More, the setting for Harington's other novels. The main character drives from town to town showing movies or "pitchers" (so he is a "pitcher shower") on improvised screens outdoors.

source: Stay More: The World of Donald Harington
text: Stay More: The World of Donald Harington Stay More: The World of Donald Harington is a 2013 documentary film about author Donald Harington, produced by Brian Walter based on interviews that Walter conducted with Harington and his wife in 2006–07.

source: Ozark Mountain American Viticultural Area
text: Ozark Mountain American Viticultural Area The Ozark Mountain AVA is an American Viticultural Area located in northwest Arkansas, southern Missouri, and northeast Oklahoma. The sixth largest American Viticultural Area in total size, Ozark Mountain AVA covers 3520000 acre . Five smaller AVAs have been established within its boundaries, to recognize those distinct regions whose climate, vineyard soil, or other growing conditions create unique areas for viticulture. The hardiness zone in the region varies from 7a to 6a.

source: The Architecture of the Arkansas Ozarks
text: The Architecture of the Arkansas Ozarks The Architecture of the Arkansas Ozarks (TAOTAO) is a 1975 book by American author Donald Harington. "TAOTAO" is an epic tale that follows six generations of "Stay Morons", beginning with its first settlers Jacob and Noah Ingledew, who travel from their native Tennessee to the Ozark region of Arkansas to found the imaginative town of Stay More. There are twenty chapters total in "TAOTAO", each chapter opening with a pencil sketch of a building that the story builds upon.

source: The Ozark Mountain Daredevils (album)
text: The Ozark Mountain Daredevils (album) The Ozark Mountain Daredevils is the debut album by the Country rock & Southern rock band The Ozark Mountain Daredevils. Sporting a patchwork quilt cover that gave some indication of its eclectic musical content, and spawned the #25 hit single "If You Wanna Get to Heaven", plus many other laid-back originals from the Missouri natives.

source: With (novel)
text: With (novel) With is a novel published in 2003 by the American author Donald Harington. The story takes place in Stay More, Harington’s mythical town in Newton County, Arkansas. "With" is part love story and part survival story about a girl’s development into a woman while living in isolation and seclusion from the rest of society.

source: Ozark Mountain Daredevils (1980 album)
text: Ozark Mountain Daredevils (1980 album) Ozark Mountain Daredevils is the seventh album (and second self-titled one) issued by the Southern-fried country-rock group The Ozark Mountain Daredevils. It is their first and only album for the Columbia Records label after having issued six previous albums on A&M Records.

source: If You Wanna Get to Heaven
text: If You Wanna Get to Heaven "If You Wanna Get To Heaven" is a single by the Ozark Mountain Daredevils from their 1973 album "The Ozark Mountain Daredevils". This is their debut single which reached #25 on the U.S. Billboard.

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Answer: Donald Douglas Harington