David Brian
David Brian  was the actor who appeared as historian John Gill in the  second season episode .

Besides his stint on Star Trek, Brian also made guest appearances in many other television series, including , , , , and Mission: Impossible. He also starred in his own series, , from 1954 through 1955. 

He also had a number of films to his credit. Among his earliest was the 1949 drama , for which he received a  nomination for Best Supporting Actor. 

Throughout the early 1950s, Brian was often seen playing the lead role in films such as  (1950, co-starring William Campbell and Ricardo Montalban) and  (1951, with John Hoyt). His other film credits include supporting roles in 1952's  (with Richard Hale) and  (with Richard Webb), 1954's  (with William Campbell, Paul Fix, and William Schallert), 1961's  (featuring Grace Lee Whitney), the classic 1962 western , 1966's  (with Brian Keith), 1968's  (with Michael Ansara), and 1969's  (with Nehemiah Persoff). His last feature film appearance was in 1971's , which also featured fellow TOS co-stars Stanley Adams and Charles Napier. He did, however, co-star with Madlyn Rhue the following year in , a made-for-TV movie.

David Brian died of cancer and heart failure in California in . He was 78 years old.

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Performers
TOS performers