David Henry Keller was a Doctor and a Lieut. Col., U.S.A., ret.
David Henry Keller (1880–1966) was most often published as David H. Keller, MD, but also known by the pseudonyms Monk Smith, Matthew Smith, Amy Worth, Henry Cecil, Cecilia Henry, and Jacobus Hubelaire. He was a writer for pulp magazines in the mid-twentieth century who wrote science fiction, fantasy and horror.
In Life Everlasting, the title story, protag invents a panacea with which he intends to "cure" society; also has the side effect of prolonging life. Story a little dry in places, dark little twist regarding protag's son, but ending was rubbish. Boneless Horror is probably the best in this collection. The Thing in the cellar, and The Dead woman, both good twists on old tropes. Keller wasn't a great writer of prose but there's no doubting he came up with some fantastic ideas.