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Colm J. Meaney ( born 30 May 1953) is an Irish actor best known for playing Miles O'Brien in Star Trek: The Next Generation (1987–1994) and Star Trek: Deep Space Nine (1993–1999). He has guest-starred on many TV shows including Law & Order and The Simpsons, and starred as Thomas C. Durant on Hell on Wheels (2011–2016). He has a career in films, appearing in Layer Cake, The Damned United, all three film adaptations of Roddy Doyle's The Barrytown Trilogy, and in Get Him to the Greek. Wikipedia