Colm J. Meaney (born May 30, 1953) is an Irish actor. He is widely known for playing Chief Miles O'Brien in Star Trek: The Next Generation and Star Trek: Deep Space Nine. He is second only to Michael Dorn in most appearances in Star Trek episodes. He has guest starred on many other television shows, from Law & Order to The Simpsons, and has a significant career in motion pictures, most notably Dick Tracy, Die Hard 2, The Commitments, Under Siege, The Last of the Mohicans, Far and Away, Con Air, Layer Cake and Pelè: Birth of a Legend