Henry James O'Brien Bedford-Jones (April 29, 1887 - May 6, 1949) was a Canadian historical, adventure fantasy, science fiction, crime and Western writer who became a naturalized United States citizen in 1908. After being encouraged to try writing by his friend, writer William Wallace Cook, Bedford-Jones began writing dime novels and pulp magazine stories. Bedford-Jones was an enormously prolific writer; the pulp editor Harold Hersey once recalled meeting Bedford-Jones in Paris, where he was working on two novels simultaneously, each story on its own separate typewriter. Bedford-Jones cited Alexandre Dumas as his main influence, and wrote a sequel to Dumas' The Three Musketeers, D'Artagnan (1928). He wrote nearly 200 novels, 400 novelettes, and 800 short stories, earning the nickname "King of the Pulps".