Question: What type of authors are Alfred Bester and Iain Banks?

Context paragraphs:
Iain Banks: Iain Banks (16 February 1954 – 9 June 2013) was a Scottish author.  He wrote mainstream fiction under the name Iain Banks and science fiction as Iain M. Banks, including the initial of his adopted middle name Menzies ( ).

Alfred Bester: Alfred Bester (December 18, 1913 – September 30, 1987) was an American science fiction author, TV and radio scriptwriter, magazine editor and scripter for comic strips and comic books.  Though successful in all these fields, he is best remembered for his science fiction, including "The Demolished Man", winner of the inaugural Hugo Award in 1953.

Golem100: Golem is science fiction novel by American writer Alfred Bester.  Currently out of print, it was published by Simon & Schuster in 1980.  It was based on Bester's short story "The Four-Hour Fugue".

Babylon 5: Final Reckoning – The Fate of Bester: Babylon 5: Final Reckoning – The Fate of Bester is a "Babylon 5" novel by J. Gregory Keyes.  It recounts the story of the final years of Alfred Bester, hiding, wanted for crimes committed during his time in Psi-Corp.

Alfred Bester (Babylon 5): Alfred Bester is a "Babylon 5" character played by Walter Koenig.  He is a senior Psi Cop and a recurring antagonist in the series.  J. Michael Straczynski named the character after the science fiction writer Alfred Bester, since telepathy is a recurring theme in his work (most notably "The Demolished Man", which partly may have inspired the Psi corps and the "death of personality" legal punishment in the Babylon 5 universe).

Redemolished: Redemolished is a collection of short stories, interviews, and other articles and essays by science fiction author Alfred Bester.  Published in 2000 (thirteen years after Bester's death) by iBooks, inc, ISBN  , edited by Richard Raucci.

Transition (novel): Transition is a novel by Iain Banks, first published in 2009.  The American edition was published under the name "Iain M. Banks", which is the name Banks used for his science fiction work.

Tender Loving Rage: Tender Loving Rage is a novel by science fiction author Alfred Bester, published posthumously in 1991, four years after Bester's death in 1987.  In his 1991 article, "Alfred Bester's "Tender Loving Rage"" (reprinted in Platt's "Loose Canon" [2001]), his friend Charles Platt explains that Bester wrote the novel around 1959 using the title "Tender Loving Rape".  The book went unsold for many years, until Platt (who had read the manuscript much earlier while working at Avon in 1972) persuaded Bester to allow him to get the book published by a small press; Platt suggested the change of title and Bester agreed.

The Demolished Man: The Demolished Man is a science fiction novel by American writer Alfred Bester, which was the first Hugo Award winner in 1953.  An example of inverted detective story, it was first serialized in three parts, beginning with the January 1952 issue of "Galaxy Science Fiction", followed by publication of the novel in 1953.  The novel is dedicated to "Galaxy"'s editor, H. L. Gold, who made suggestions during its writing.  Bester's title was "Demolition!" , but Gold talked him out of it.

Time is the Traitor: "Time Is the Traitor" is a science fiction short story by American writer Alfred Bester, originally published in "The Magazine of Fantasy and Science Fiction" in September, 1953.  It is included in the Bester collections "The Dark Side of the Earth" (1964), "Star Light, Star Bright" (1976) and "Virtual Unrealities" (1997) and has been extensively anthologized.

Supporting paragraphs: Alfred Bester Iain Banks
Answer: fiction author