Robert Arthur Jr. was a writer and editor of crime fiction and speculative fiction known for his work with The Mysterious Traveler radio series and for writing The Three Investigators, a series of young adult novels.
Robert Arthur Jr. at work during 1950.
Arthur's novelette "The Mirror of Cagliostro " was the cover story for the June 1963 issue of Fantastic Stories, illustrated by Lee Brown Coye
Arthur as pictured in Wonder Stories in 1931
The Mysterious Traveler was an anthology radio series, a magazine, and a comic book. All three featured stories which ran the gamut from fantasy and science fiction to straight crime dramas of mystery and suspense.
Tales of the Mysterious Traveler #7 (March 1958)
Front cover of the November 1951 issue
Luis van Rooten on The Mysterious Traveler