 He has since garnered a raft of major broadcast credits, including five U.S. appearances on "Late Night with Conan O'Brien" (NBC).In July 2007, Byrne made his début at the Newbury Comedy Festival, having participated in the Cat Laughs Comedy Festival in Kilkenny shortly before.He recorded a live DVD "Different Class" at The King's Theatre, Glasgow, on 23 March 2009, which was released on 23 November of that year.