Theatre includes: The Walworth Farce (National Theatre), Penelope (Hampstead Theatre), Wallenstein, King Lear (Chichester Festival Theatre), Translations, The Wild Duck, (Abbey Theatre, Dublin), The Heiress, Who’s Afraid of Virginia Woolf, The Gigli Concert (nomination Best Actor, IT Theatre Awards 2015), A Streetcar named Desire (nomination Best Supporting Actor, IT Theatre Awards 2013), Glen Garry Glenross, The Price, An Enemy of the People (Gate theatre Dublin), Amadeus, Macbeth, Myrmidons, Tales from Ovid, Making History, Richard 11, Richard III (Best Actor Award, IT Theatre Awards 2001), Troilus and Cressida (Ouroboros Theatre Company), The Gigli Concert (Best Actor Award, IT Theatre Awards 2010, Druid Theatre Company), End of Day (Enniskillen Happy Days Festival/Paris/West Cork fit-up).
Television includes: Single Handed II, Showbands, The Clinic, On Home Ground , Fair City, Rebel Heart, Quirke, The Truth Commissioner, Yesterday’s Children, Trial of the Century, Hollywood in Éireann, Scúp 1 and 2, The Running Mate.
Film includes: Brooklyn, Garage, The Wind that Shakes the Barley, Tiger’s Tail, Alexander, Michael Collins.
Denis was the Artistic Director of Ouroboros Theatre Company for 10 years. He is also member of the board of the Brian Friel trust.