He published several novels in the Western genre, often under the pen name Brad Ward, before moving into American series television after being given a script assignment by Frank Gruber.
Peeples was a literary science fiction enthusiast who also occasionally wrote science fiction for Television, starting by providing advice and reference material to friend and colleague Gene Roddenberry as the latter created what became the original Star Trek series.
Peeples wrote an unused alternative script, Worlds That Never Were, for the second Star Trek motion picture.
Peeples wrote a number of episodes for Filmation's live action Space Academy and Jason of Star Command series and wrote the script for their animated TV movie and seven first-season episodes of the Flash Gordon series that resulted from it.
[3] Peeples died of cancer on August 27, 1997, at age 79, just one month short of his eightieth birthday.