“The Mansion” is written by

The Mansion,novel by William Faulkner, first published in 1959 as the third volume of his Snopes trilogy.
The bibliography of William Faulkner, an American writer, includes 19 novels, 125 short stories (not including stories that appear exclusively in novels), 20 screenplays (including uncredited rewrites), one play, six collections of poetry as well as assorted letters and essays.

Source:Britannica.com