Classics & Blockbusters:
* Jaws (1975) - Chief Brody
* The French Connection (1971) - Detective Buddy "Popeye" Doyle (Nominated for Best Supporting Actor Academy Award)
* Marathon Man (1976) - Dr. Thomas "Tommy" Levy
* All That Jazz (1979) - Joe Gideon
* 2010 (1984) - Dr. Floyd
* The Seven-Ups (1973) - Detective Detective "Butchie" Harmon
* The Exorcist II: The Heretic (1977) - Father Damien Karras
Other Notable Roles:
* Klute (1971) - Detective John Klute
* The Last Detail (1973) - Bud "Mule" Miller
* Car Wash (1976) - Larry
* The Deer Hunter (1978) - Michael
* Blue Thunder (1983) - Frank Murphy
* The Right Stuff (1983) - Chuck Yeager
* 52 Pick-Up (1986) - Harry Bernsen
* Sea of Love (1989) - Frank Keller
* The Russia House (1990) - Bartholomew "Barty" Blair
* The Paper (1994) - Henry Hackett
* The Phantom (1996) - James "Jimmy" Wells
Television:
* SeaQuest DSV (1993-1996) - Captain Nathan Bridger (TV series)
* Third Watch (2000-2005) - Captain Carl "Sarge" Engel (TV series)
This list isn't exhaustive but includes many of his most memorable films. You can find a full filmography on websites like IMDb.