Clark Ross
Real world article
(written from a production point of view)
Clark Ross (2 August 1913–24 September 1987; age 74) was an actor who played an Iotian passerby in the Star Trek: The Original Series second season episode "A Piece of the Action". As a background performer, he was not credited for his role.
He filmed his scene on Monday 6 November 1967 on location at Paramount's McFadden Street backlot.