Colm Meaney began at the age of 14 years with the acting classes at the Abbey Theatre School of Acting, a year later he became a member of the National Theatre of Ireland. He spent eight years in England as a theater actor. He also tied first contacts to television. 1992 Meaney played in the pilot episode of Dr. Quinn - Medicine Woman the role of Jake Slicker, but this was subsequently taken over by the actor Jim Knobeloch.
Meaney is best known for playing the role of transporters Chiefs and later chief engineer Miles O'Brien in the television series Star Trek: The Next Generation and Star Trek: Deep Space Nine. In addition, he was seen primarily as a prototype of the little man in a number of English and Irish productions, such as in The Englishman Who Went Up a Hill But Came Down a Mountain and The Commitments. For his performance in The Snapper, he was nominated in 1994 as Best Actor for the Golden Globe. In Stargate Atlantis, he had a recurring guest role as the leader of the alien people of the Genii. Meaney was occupied Against the grain 2003 as a particularly hard-nosed cop in Intermission, directed by John Crowley. In 2013 he stands beside Rufus Sewell and Anne Heche in the thriller The Occult front of the camera.
In Germany it usually Roland Hemmo lends his voice.