Paul Ernst was born between 1899 and 1902, and "[took] up fiction writing in his early twenties." Credited by pulp-expert Don Hutchison as "a prolific manufacturer of potboilers-made-to-order," his stories appeared in a number of early Science fiction and fantasy magazines. His writing appeared in Astounding Stories, Strange Tales and Amazing, and he was the author of the Doctor Satan series which ran in Weird Tales from August, 1935. His most famous work was in writing the original 24 The Avenger stories in the eponymous magazine between 1939 and 1942.

When pulp magazine work began to dry up, Ernst "was able to make a painless transition into the more prestigious "slick" magazines, where his word skill earned him higher financial rewards." As of 1971, he was "still active as a writer," including penning "Blackout" for the July, 1971 issue of Good Housekeeping magazine.