Rampungake ukara ing ngisor iki: O'Neill minangka veteran Festival Fringe Edinburgh, sing nindakake pertunjukan stand-up utawa teater ing kana luwih saka rong puluh taun. Dheweke dicalonake kanggo 1994
Perrier Award kanthi pertunjukan "It's a Bit Like This", lan menang Fringe First ing taun 1999 karo Sean Hughes kanggo pertunjukan teater "Dehydrated and Travellin 'Light". Set teater kalebu 12 Angry Men, One Flew Over The Cuckoo's Nest lan The Odd Couple. Stand-up wis kalebu "Off My Face" lan "It Was Henry Fonda's Fault".