David Tomblin
From Wookieepedia, the Star Wars wiki.
David Tomblin was the first assistant director on Star Wars Episode V: The Empire Strikes Back and Star Wars Episode VI: Return of the Jedi (1983). He also wrote and directed Warwick Davis' short film Return of the Ewok during production on Return of the Jedi in 1982. In this film, he stared as the voice of Darth Vader over actor David Prowse.
