Jonjo O'Neill. Jonjo O'Neill (born 11 July 1978 ) is a Northern Irish actor known for his stage and television work. Jonjo O'Neill (actor) - WikiMili, The Free Encyclopedia. Jonjo O'Neill, Actor: Murphy's Stroke. He moved to England to study at the Guildford School of acting from 1996 to 1999. WikiMili The Free Encyclopedia. Jonjo O'Neill ~ Actor Jonjo has performed in film, tv, theatre & radio. Jonjo O'Neill is an actor, known for Murphy's Stroke (1980) and This Is Your Life (1955). 1,824 Followers, 1,108 Following, 251 Posts - See Instagram photos and videos from Jonjo O'Neill (@jonjooneill) Jonjo O'Neill was born in Belfast, Northern Ireland in 1978. Jonjo O'Neill (born 11 July 1978 ) is a Northern Irish actor known for his stage and television work. He is an Associate Artist with the RSC; perhaps best known for his portrayals of Richard III and Mercutio.