John Donald Francis Black began his writing career in the late 1950s with the horror film The Unearthly (1957, featuring Arthur Batanides). After that, he worked on several television shows. In 1964, he won a Writer’s Guild award for an episode of the television series Mr. Novak (in which Walter Koenig incidentally guested). Gene Roddenberry invited him to visit his home following the ceremony, a kind of impromptu audition that turned into a job offer. Black served as the first Executive Story Consultant, and also worked as an Associate Producer (along with the more famous Robert Justman). He met his future wife, then Mary Stowell, while working there.

His writing contribution to Star Trek: The Original Series was limited to a single episode, “The Naked Time”, that was later reprised as an episode of Star Trek: The Next Generation. He once said the hardest part of his supervisory job was dealing evenhandedly with writers – both those who intimidated him, like Theodore Sturgeon, and those he felt weren’t living up to the show’s standards. Black left the series when he got a big-money contract from Universal Pictures. The last episode he worked on as associate producer was “Miri”, although as a writer he also contributed to the script of “The Menagerie, Part I” and “The Menagerie, Part II”.