Biography - Declan's appearances at the Abbey and Peacock Theatres include "True West", "All My Sons", "Henry IV", "A Whistle in The Dark", "Famine", "The Hamlet Project", "The Last Ones","The Patriot Game" and most recently "A Month in the Country". He also appeared in Rough Magic's new production 'Improbable Frequency' for the Dublin Theatre Festival (2004) which transferred to the Abbey Theatre in 2005. Other theatre work includes: "The Walls", "The Ends of The Earth", "The Machine Wreckers" (Royal National Theatre), "As You Like It", "La Lupa", "The Mysteries", "The Spanish Tragedy", "Henry VI Part III" (RSC), "Macbeth" (West End), "Our Country's Good" (Young Vic), "Juno and The Paycock" (Gaiety), "Decadence", "Hamlet", "Endgame" (Naked Theatre Company), Rough Magic's "Copenhagen" and "The Book of Evidence" (Kilkenny Arts Festival/Gate Theatre), "True West" (Lyric, Belfast), 'Heavenly Bodies' directed by Lynne Parker, Television includes: "Proof", "Anytime Now", "Bachelor's Walk". "Hot House", "Dangerfield" and "The Family". Film includes "All Souls' Day" and "The Truth About Sex". Declan recently appeared in " Julius Caeser", at the Abbey Theatre and most recently appeared as John Proctor in Patrick Mason's acclaimed production of "The Crucible" at the Abbey Theatre and is currently appearing as Mendosa, in "The Tudors", Season I, (Showtime/Working Title).