He is best known for the groundbreaking science fiction short story, "A Martian Odyssey", which presented a sympathetic but decidedly non-human alien, Tweel. Even more remarkably, this was his first science fiction story (in 1933 he had sold a romantic novel, "The Lady Dances", to King Features Syndicate, which serialized the story in its newspapers in early 1934). Isaac Asimov has described "A Martian Odyssey" as "a perfect Campbellian science fiction story, before John W. Campbell. Indeed, Tweel may be the first creature in science fiction to fulfil Campbell's dictum, 'write me a creature who thinks "as well as" a man, or "better than" a man, but not "like" a man'." Asimov went on to describe it as one of only three stories that changed the way all subsequent ones in the science fiction genre were written. It is the oldest short story (and one of the top vote-getters) selected by the Science Fiction Writers of America for inclusion in "The Science Fiction Hall of Fame, Volume One, 1929–1964".