<Tr> <Th> Occupation </Th> <Td> Actor </Td> </Tr> <Tr> <Th> Years active </Th> <Td> 1990--2002 </Td> </Tr> <P> Glenn Martin Christopher Francis Quinn (May 28, 1970--December 3, 2002) was an Irish actor . While he was best known for his portrayal of Mark Healy on the popular' 90s family sitcom Roseanne, Quinn also amassed a large fan base for his portrayal of Doyle, a half - demon, on Angel, a spin - off series of Buffy the Vampire Slayer . </P> <P> Quinn was born in Dublin, Ireland on May 28, 1970, the son of Murty Quinn, a musician and singer with the Miami Showband who enjoyed seven #1 hits in the' 60s and' 70s, and his wife, Bernadette Quinn (nee Brady). He was raised in Cabinteely, a suburb of Dublin, and attended Clonkeen College . He immigrated to the United States with his mother and two sisters, Sonja and Louisa, in 1988, when he was still just a teenager, with the family settling in Los Angeles, California . Quinn had a third sibling, a brother Ciaran, whom he never knew existed as the boy had been placed for adoption . </P>

What was the guy's name that played mark on roseanne