- Served in the U.S. Marine Corps from 1960 to '65.
- Worked as a meat-truck driver, salesman, motel clerk and bartender before acting.
- Attended Columbia University on a football scholarship.
- Worked as a Wall Street stockbroker for a short time; one of his coworkers was Martha Stewart.
- Big-screen breakthrough came with the role of Sheriff Will Teasle in 1982's First Blood.
- Produced, wrote, directed and starred in a series of TV movies about police officer Jack Reed, beginning with 1992's Deadly Matrimony.
- Played the role of Willy Loman in Arthur Miller's Death of a Salesman for more than 600 performances.
- Narrated the 2009 docudrama Death or Canada, which chronicles the Irish immigration to Toronto during the potato famine; was inspired to do the project by his grandfather, who immigrated to the United States from Ireland as a boy.
- Is an accomplished sailor.
- 1999, Tony — Actor (Play): Winner
- 2003, Tony — Actor (Play): Winner
- 2000, Screen Actors Guild Awards — Outstanding Performance by a Male Actor in a Television Movie or Miniseries: Winner
- 1993, Emmy — Outstanding Supporting Actor in a Miniseries or Special: Nominee
- 2000, Emmy — Outstanding Lead Actor in a Miniseries or a Movie: Nominee
- 2001, Golden Globe — Best Performance by an Actor in a Miniseries or Motion Picture Made for Television: Winner
- 1992, Emmy — Outstanding Lead Actor in a Miniseries or Special: Nominee
- 1990, Emmy — Outstanding Supporting Actor in a Miniseries or Special: Nominee
- 2005, Emmy — Outstanding Supporting Actor in a Miniseries or a Movie: Nominee
- 1992, Emmy — Outstanding Supporting Actor in a Miniseries or Special: Nominee
- Michael Dennehy — Brother
- Cormac Dennehy — Son
- Deirdre Dennehy — Daughter
- Edward J. Dennehy, Jr — Brother
- Hannah Dennehy — Mother
- Jennifer Arnott — Wife
- Edward J. Dennehy — Father
- Kathleen Dennehy — Daughter
- Elizabeth Dennehy — Daughter
- Judith Scheff — Ex-wife
- Sarah Dennehy — Daughter
- Columbia University, New York, NY (BA in History, 1960)
Season 3, Episode 4
- Birth Place: Bridgeport, CT
- Birthday: July 9, 1938, Cancer
- Profession: Actor, Producer, Director, Screenwriter
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