He married his wife Dorothy Daniels (nee Smith) in 1931; they both subsequently became professional writers, and collaborated frequently.
Subsequently editor Leo Margulies hired Daniels to write a novel featuring The Phantom Detective, a pulp hero inspired by the highly successful character The Shadow.
[3] The result was the Black Bat, former district attorney Tony Quinn, who dons a bat-themed costume to fight crime after an acid attack apparently blinds him.
Daniels also created the Crimson Mask and contributed to a variety of other magazines in various genres, including The Shadow and Doc Savage.
Daniels continued writing into the 1980s, and he and Dorothy donated their papers to Bowling Green University's Browne Popular Culture Library.