author
1878–1959
Best known as a pen name used on adventure stories for young readers, this early-20th-century writer is linked to brisk mysteries, gadgets, and cliffhanger plots. The name appears most often on boys' fiction published alongside other pseudonyms in a very active pulp-era career.

by David O'Hara
David O'Hara is best understood as one of the pseudonyms associated with Roy J. Snell (1878–1959), a prolific American writer of popular fiction for younger readers. Booksellers and library-style listings repeatedly connect the name David O'Hara with Snell, alongside other pen names such as James Craig and Joseph Marino.
That publishing background helps explain the feel of the books: fast-moving juvenile adventures built around mysteries, danger, and contemporary thrills. Under the David O'Hara name, surviving listings point to titles with a detective-and-invention flavor, suggesting work aimed at readers who liked suspense, resourceful young heroes, and the excitement of modern technology.
Because reliable biographical information specific to the David O'Hara byline is limited, it is safest to treat it as part of Snell's broader writing identity rather than as a separate public author persona. No suitable verified portrait for this byline was confirmed from the sources reviewed, so a profile image is not included.