Information from Lisa Richard’s Agency:

Denis is a founding member of the Ouroboros Theatre Company (originally Theatreworks). He can next be seen in Sliced, a returning series for DAVE.

Film/TV credits include: 
Blood (Virgin Media), Sweetness in the Belly (Parallel Films), Red Rock(TV3), The Bailout (Virgin Media One), End of Sentence (Samson Films), Fair City (RTÉ), Trial of the Century (TV3), The Truth Commissioner(Samson Films), Penny Dreadful (Showtime), Brooklyn (Parallel Films), Scúp (TG4), Quirke (BBC One), An Crisis (TG4), Titanic: Blood and Steel (Starz), Single-Handed (RTÉ), Zonad (Element Pictures), The Running Mate (TG4, IFTA nomination), Garage (Element Pictures), The Tiger’s Tail (Merlin Films), Showbands II (Parallel Films), The Wind that Shakes the Barley (Element Films), Hide & Seek (RTÉ), Boy Eats Girl (Element Films), Showbands (Parallel Films), The Clinic (RTÉ), Alexander (Warner Bros., Dir: Oliver Stone), The Return (Octagon Films), Bachelor’s Walk (RTÉ), Intermission (Dreamworks, Dir: John Crowley), On Home Ground (RTÉ), Reign of Fire (Touchstone Pictures), Ballykissangel, Rebel Heart, Custard’s Last Stand Up (BBC One), Trí Scéal (TG4), Yesterday’s Children (CBS), Casualty (BBC), Making Ends Meet (RTÉ), I Went Down (Treasure Entertainment), Michael Collins (Warner Bros., Dir: Neil Jordan) & The Governor (ITV). 

Theatre credits include: 
Alone In Berlin (Royal & Derngate), Glengarry Glen Ross (ATG Tour), Chasing Bono (Soho Theatre), The Lieutenant of Inishmore (West End, Dir: Michael Grandage), Afterplay (The Gate Theatre, Dir: Mark O’Rowe), The Heiress, Who’s Afraid of Virginia Woolf (The Gate Theatre), Bailed Out! (Fishamble, Dir: Conall Morrison), The Gigli Concert (The Gate Theatre, Irish Times Theatre Award Winner), You Never Can Tell(The Abbey Theatre), King Lear (BAM, Chichester Festival), The Price, An Enemy of the People (The Gate Theatre, Dir: Wayne Jordan), Richard III (Ouroboros), A Streetcar Named Desire, Glengarry Glenn Ross(The Gate Theatre), Stoker (Ouroboros), The Speckled People (The Gate Theatre), Translations, Christ Deliver Us, Penelope (The Abbey Theatre, St. Ann’s Warehouse, The Hampstead Theatre), Wallenstein(Minerva Theatre), Playboy of the Western World (Druid Theatre, Dir: Garry Hynes), Riders to the Sea, Purgatory, The Dandy Dolls (The Peacock Theatre, Dir: Conall Morrison), The Death of Harry Leon(Ouroboros), The Walworth Farce (Edinburgh, St. Ann’s Warehouse, Royal National Theatre), Making History (Ouroboros), The Recruiting Officer (Dir: Lynne Parker), Homeland (Abbey Theatre), Myrmidons(Ouroboros), A Cry from Heaven (The Abbey Theatre), Amadeus(Theatreworks), Macbeth (The Olympia Theatre), The Wild Duck (The Abbey Theatre), Frank Pig Says Hello (Co-Motion), Studs (The Gaiety Theatre), Tales from Ovid (Theatreworks), Diarmuid and Gráinne(Edinburgh), Richard III (Theatreworks, Irish Times Best Actor Award), Romeo and Juliet (Everyman Theatre), Troilus and Cressida (Samuel Beckett Theatre), MUTABILITIE (Samuel Beckett Theatre), Juno and the Paycock (Steeple Theatre), April Bright (Abbey Theatre), Buddleia(Donmar Warehouse), Long Black Coat, The Comedy of Errors, The Crucible, The Coleen Bawn, The Freedom of the City, Judas of the Gallarus (The Abbey Theatre), Native City (Passion Machine), Volpone, Castle Rackrent (Meridian Productions), Miss Julie, Chun Na Farraige Sios, Psadh and Tincara, An Triall and Liodán na hAbhann(Amharclann de hIde).