David H. Keller (full name David Henry Keller; December 23, 1880 – July 13, 1966) was a writer for pulp magazines in the mid-twentieth century known for his science fiction, fantasy and horror stories. He was also a licensed psychiatrist who served with the U.S. Army Medical Corps during World Wars I and II and also served as the Assistant Superintendent of the Louisiana State Mental Hospital at Pineville for a time. In 1929, Keller was first published as a writer of speculative fiction in Hugo Gernsback’s Science Wonder Stories, where his fiction proved noteworthy for its high quality and intelligent mindset. His background as a psychiatrist often informed his writing, as it does with this story, “The Thing in the Cellar,” a classic story of something lurking in the darkness. We’re delighted to feature this story as part of our 12 Days of Monsters. - The Editors