David Henry Keller was an American writer who worked for pulp magazines in the mid-twentieth century, in the science fiction, fantasy, and horror genres. He was also a psychiatrist and physician to shell-shocked soldiers during World War I and World War II, and his experience treating mentally ill people is evident in some of his writing, which contains references to mental disorders. He initially wrote short stories as a hobby and published his first science fiction story in Amazing Stories in 1928. He continued to work as a psychiatrist while publishing over sixty short stories in science fiction and horror genres. Technically, his stories were not well-written, but focused on the emotional aspects of imaginative situations, which was unusual for stories at the time.

Amazing Stories is an American science fiction magazine launched in April 1926 by Hugo Gernsback's Experimenter Publishing. It was the first magazine devoted solely to science fiction. Science fiction stories had made regular appearances in other magazines, including some published by Gernsback, but Amazing helped define and launch a new genre of pulp fiction.