In 1924, at the age of 22, he sold his first short story, "The Desert Lich", to Weird Tales magazine. Throughout the next four decades, Long was to be a frequent contributor to pulp magazines, including two of the most famous: Weird Tales (under editor Farnsworth Wright) and Astounding Science Fiction (under editor John W. Campbell). Long was an active freelance writer, also publishing many non-fiction articles.