Biography from the Contemporary Music Centre of Ireland with complete works list, recordings and scores for sale, related reading, and profile in PDF format.

Brief biography with major works from the Ireland's Millennia pages of RTÉ Irish public radio.

Biography from Naxos tracing his musical development and major influences.

Extended biography by David Wright for Music on the Web details moves, emotional and psychological influences on his works, and his sometimes violent and combative nature.

Brief biography noting studies and influences, major works, and positions held from the Grove Concise Dictionary of Music entry at WQXR radio.