(written from a Production point of view)
John Kingsbridge was the pen name of writer John T. Dugan (11 October 1920 – 24 December 1994; age 74). He wrote "Return to Tomorrow", a second season episode of Star Trek: The Original Series. In 1968 he earned a Writers Guild of America Award nomination for his Star Trek contribution.
Dugan, writing as Kingsbridge, went on to co-write an episode of the NBC television series Mission: Impossible entited "The Vault" along with "The Tholian Web" co-writer Judy Burns. Also writing as Kingsbridge, he co-wrote the 1969 film Shark! and served as a writer on Adam-12 and Doc Elliot.