1987 - 1993 - Star Trek: The Next Generation (Chief Miles Edward O'Brien)
1993 - 1999 - Star Trek: Deep Space Nine (Chief Miles Edward O'Brien)
1995 - 1995 - One Life to Live
2002 - 2002 - R.U.S./H. (Capt. Mike Gunnison)
Tv Movies:
1987 - Kenny Rogers as The Gambler, Part III: The Legend Continues (Tinkerer)
1993 - Dr. Quinn, Medicine Woman (Jake Slicker)
1993 - The Snapper (Dessie Curley)
2002 - King of Texas (Tulimson)
Specials and Mini Series:
1981 - Les Roses de Dublin (TV Mini Series) (Michael Kavanaugh)
1994 - Scarlett (TV Mini Series) (Father Colum O'Hara)
1995 - The Science of Star Trek (Himself)
1995 - Journey's End - The Saga of Star Trek: The Next Generation (Himself)
1999 - The Magical Legend of the Leprechauns (TV Mini Series)
(Seamus Muldoon)
1999 - Star Trek: The Next Generation Companion (Chief Miles O'Brien)
2001 - Random Passage (TV Mini Series) (Thomas Hutchings)
Voice Acting and Narration:
Movies:
1981 - Nailed (Younger Protestant)
1987 - The Dead (Mr. Bergin)
1987 - Omega Syndrome
1990 - Dick Tracy (Cop at Tess')
1990 - Die Hard 2 (Pilot) (Windsor Plane)
1990 - Come See the Paradise (Gerry McGurn)
1991 - The Commitments (Jimmy Rabbitte, Sr.)
1992 - Far and Away (Kelly)
1992 The Last of the Mohicans (Major Ambrose)
1992 - Under Siege (1Doumer)
1992 - Into the West (Barreller)
1994 - The Road to Wellville (Dr. Lionel Badger)
1994 - War of the Buttons (Geronimo's Dad)
1995 - Ripple
1995 - The Englishman Who Went Up a Hill But Came Down a Mountain
(Morgan the Goat)
1996 - The Last of the High Kings (Jim Davern)
1996 - The Van (Larry)
1997 - Con Air (DEA Agent Duncan Malloy)
1998 - Snitch (Jackie O'Hara)
1998 - This Is My Father (Seamus, Owner of the Bed-and-Breakfast)
1998 - October 22 (Patron)
1998 - Vig (Al Sheehan)
1998 - Claire Dolan (Roland Cain)
1999 - Four Days (Fury)
1999 - Mystery, Alaska (Mayor Scott R. Pitcher)
1999 - Chapter Zero (Frank Lazarus)
1999 - Most Important (Dan O'Neill)
2001 - How Harry Became a Tree (Harry)
2002 - Backflash
2002 - Blueberry
Plays:
Director:
Writer: