Patrick Cassidy was born in Claremorris, Co. Mayo. A trained mathematician, he is self-taught as a composer and works mainly in film and television.
He is best known for his successful setting of The Children of Lir (1991), an oratorio which was performed and recorded by the Tallis Choir and the London Symphony Orchestra in 1993/94. Among the film scores which he has written are Broken Harvest, released in the USA in 1996. In the same year, Famine Remembrance, a requiem commemorating the 150th anniversary of the Irish famine, was premiered in St Patrick’s Cathedral, New York, by the St Patrick’s Cathedral Orchestra and Choir under John-Michael Caprio, with Anjelica Huston as narrator.