John Fiedler

Actor (Hengist) — The Original Series

American character actor (1925–2005), a juror in 12 Angry Men and the long-time voice of Piglet, who played the administrator Hengist in Wolf in the Fold.

John Fiedler was an American character actor, born in 1925, recognisable for his gentle, high-pitched voice. He played one of the jurors in the 1957 film 12 Angry Men, appeared in The Odd Couple and The Bob Newhart Show, and voiced Piglet in Disney's Winnie the Pooh films for decades.
In Star Trek he guest stars in the second-season episode Wolf in the Fold, written by Robert Bloch and first shown in 1967. He plays Hengist, a mild administrator from Rigel IV working on Argelius II, who leads the murder inquiry against Scotty and is finally exposed as the host of the ancient entity once known as Jack the Ripper.
Fiedler died in 2005.