Question:  Penelope Spheeris and Art Hindle are both directors, but only one of them is an actor. Which one? 

Context paragraphs:
Face-Off (1971 film): Face-Off is a 1971 Canadian feature film produced by John F. Bassett starring Art Hindle, Trudy Young and John Vernon.  The story line concerns a rookie Toronto Maple Leafs ice hockey player and his romance with a musician.  Several National Hockey League players also appeared in the film.

The Decline of Western Civilization III: The Decline of Western Civilization III is a 1998 documentary film directed by Penelope Spheeris that chronicles the gutter punk lifestyle of homeless teenagers.  It is the third film of a trilogy by Spheeris depicting life in Los Angeles at various points in time.  The first film "The Decline of Western Civilization" dealt with the punk rock scene during 1980-1981.  The second film "" covers the Los Angeles heavy metal movement of 1986-1988.

Blind Trust: Blind Trust is a 2007 Canadian film starring Jessica Capshaw and Art Hindle shot in Montreal.

Penelope Spheeris: Penelope Spheeris (born December 2, 1945 or 1946; sources differ) is an American film director, producer and screenwriter.  She is best known as a documentary film director whose works include the trilogy titled "The Decline of Western Civilization".  She has directed feature films, including "Wayne's World", her highest-grossing film.

Matthew Felker: Matthew Felker is an American writer, producer, actor, and model.  He is currently starring and an executive producer on the Penelope Spheeris directed comedy titled "Balls to the Wall" opposite Mimi Rogers, Christopher McDonald, Joe Hursley, Colleen Camp and Jenna Dewan.  He works often with directors Penelope Spheeris and Joseph Kahn.

The Gunfighters (1987 film): The Gunfighters is a 1987 television Western film, starring Art Hindle and George Kennedy, directed by Clay Borris.

Liar, Liar (1993 film): Liar, Liar is a 1993 Canadian drama television film starring Vanessa King as a girl who accuses her father (Art Hindle) of molestation, only to have no one in her family believe her.  The film originally aired in January 1993 on CBC Television in Canada.

Art Hindle: Arthur Hindle (born July 21, 1948) is a Canadian actor and director.

The Wild Pony: The Wild Pony is a made for pay-TV movie produced in 1983 by Kevin Sullivan ("Anne of Green Gables") and Eda Lishman.  Sullivan and Lishman also co-wrote the screenplay based on the book "The Year of the Black Pony" by American author Walt Morey.  "The Wild Pony" has the distinction of being the first example of a Canadian film produced specifically for pay-TV.  The film, directed by Kevin Sullivan and starring Canadian Actors Marilyn Lightstone, Art Hindle and Josh Byrne, was filmed in Calgary, Alberta against the backdrop of the Canadian Rockies.

Chris Spheeris: Chris Spheeris (in Greek: Χρήστος Σφυρής) is a Greek-American composer of instrumental music.  He is a producer, vocalist and multi-instrumentalist.  Chris is the cousin of Penelope Spheeris and her brother Jimmie Spheeris.  Born in Milwaukee, Wisconsin, Chris began writing songs on his guitar as a teenager.  In 1985, Chris began composing for film.  His work in collaboration with filmmaker Chip Duncan includes the television series Is Anyone Listening, the series Mystic Lands (Discovery Networks), In A Just World (PBS) and the classroom production entitled The Life & Death of Glaciers (Discovery Education).

Supporting paragraphs: Penelope Spheeris Art Hindle
Answer: Arthur Hindle