Glenn Martin Christopher Francis Quinn was an Irish actor, best known for his roles on American television. He rose to prominence playing Mark Healy on the popular sitcom 'Roseanne' and later gained a cult following as the half-demon Allen Francis Doyle on the first season of 'Angel'. Born in Dublin, he moved to the United States in 1988, where he pursued his acting career. Tragically, his life and promising career were cut short when he died at the age of 32.