Colm J. Meaney is an Irish actor widely known for playing 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 TV shows from Law & Order to The Simpsons, and currently stars as railroad magnate Thomas Durant on AMC"s hit drama series Hell on Wheels.

He has also had a significant career in motion pictures, appearing in the British sports film The Damned United and all three film adaptations of Roddy Doyle"s The Barrytown Trilogy.