- Brother of Paul Cusack, Sinéad Cusack, Sorcha Cusack and Niamh Cusack; half-brother of Catherine Cusack.
- He is brother to actresses Sinéad Cusack, Sorcha Cusack, Niamh Cusack and Catherine Cusack. He is uncle to actors Max Irons and Calam Lynch and father to actress Megan Cusack.
- Educated at Trinity College Dublin, Ireland; Royal Northern College of Music, Manchester, England and University College, Cork, Ireland. Producer for The Royal National Theatre, London, England.
- Son of Cyril Cusack and Maureen Cusack.
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