Dion joined Red Stitch as an ensemble member in 2003. Red Stitch credits include Herding Cats, Penelope, The City, Creditors, That Face and Day One. A Hotel, Evening. Further theatre credits include The Tempest (Horned Moon Productions, CUB Malthouse), Marat Sade (Athenaeum Two), The Lover (Wax Studio), The Warehouse (Artifice Productions, North Melbourne), Betrayal, The Maids, and Love, Valour, Compassion! (Gasworks Theatre, Midsumma festival). Television credits include Stingers, City Homicide and Conspiracy 365. He also played the role of Fiennes in the feature film, Killer Elite.