- Studied at Dublin's Abbey School of Music & Drama, and later joined the theatre's stock company.
- Made his TV debut in 1978 on the BBC crime drama Z Cars.
- Best known for playing Miles O'Brien on Star Trek: The Next Generation and Star Trek: Deep Space Nine from 1987 to '99.
- Made the leap to the big screen in the late '80s, appearing in John Huston's The Dead (1987), as well as 1990's Dick Tracy and Die Hard 2.
- Has shown up on numerous TV series since Star Trek, including Law & Order: Criminal Intent and Stargate: Atlantis.
- 1994, Golden Globe — Best Performance by an Actor in a Motion Picture - Musical or Comedy: Nominee
- 0, — :
- Ines Glorian — Wife
- Brenda Meaney — Daughter
- Bairbre Dowling — Ex-wife
- Ada — Daughter
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