I just know he wrote "The Band played Waltzing Matilda" (heard from The Pogues), "Now I´m Easy" (Dubliners), "My Youngest Son Came Home Today" (Billy Bragg). I once tried to look for him on the net but, you know, with all that crap around... So maybe it´s better if I ask the Mudcat.
Oh, by the way, what´s your favourite site about Dubliners? (Same thing to say).