Killian is originally from Ireland and has become known for his work as an actor, singer, director and writer.

Theatre includes: swing and understudied and played Valjean and Javert in Les Misérables (Queen’s), ensemble in Sweeney Todd (Gate, Dublin), Collins in Michael Collins – A Musical Drama (Cork Opera House/Theatre Royal, Waterford), Ethan in The Full Monty (Goldenboy Irish tour), Rod/Tenor in Singin’ in the Rain (Goldenboy Irish tour), Aladdin (Cork Opera House), ensemble in Seagulls Dance (Irish premiere, Draoicht, Dublin), Declan in The Wiremen (world premiere, Gaiety, Dublin) and Prince in Cinderella (Gaiety, Dublin).

Concerts include: You Should Be Dancing (National Concert Hall) and Les Misérables (Bournemouth Symphony Orchestra, Isle of Wight).

Television includes: Showbands (BBC), The Last Furlong and Batchelors Walk (RTE), The Tudors (BBC), The Late Late Show and Open House (RTE).

Radio includes: The Butcher Boy (BBC).

Recordings include: many albums, including Tommy Fleming’s Voice of Hope and A Life Like Mine for Universal Productions.