John Mahon

1973

• [ 8/10 ] The Exorcist (Language Lab Director) 

1976

• [ ] Collision Course: Truman vs. MacArthur (Gen. Hoyt Vandenberg) 

1977

• [ ] A Killing Affair (Det. Shoup) 

1978

• [ ] Someone's Watching Me! (Frimsin) 

1984

• [ ] Victims for Victims: The Theresa Saldana Story (????) 

1986

• [ ] Betrayed by Innocence (Bailiff) 

1987

• [ ] Six Against the Rock (Officer Bill Miller) 

1988

• [ ] The Couch Trip (Police Captain) 

1991

• [ ] One False Move (Chief Jenkins) 
• [ ] The People Under the Stairs (Police Sergeant) 

1992

• [ ] Final Shot: The Hank Gathers Story (LMU Coach) 

1994

• [ ] Roswell (Red Hat Vet) 

1995

• [ ] The American President (Chairman of the Joint Chiefs) 

1997

• [ ] L.A. Confidential (Police Chief) 

1998

• [ ] Armageddon (Karl) 

1999

• [ ] Austin Powers: The Spy Who Shagged Me (NATO Colonel) 

2001

• [ ] Just Ask My Children (Judge Ferguson) 

2007

• [ 6/10 ] Zodiac (Riverside Captain) 

2009

• [ ] A Call to Arms (Major General Cosgrove USMC)