Born in Dalkey, Co. Dublin, he is the fifth child of actors Cyril Cusack and Maureen Cusack. He is brother to actresses Sinéad Cusack, Sorcha Cusack, Niamh Cusack and Catherine Cusack. He was Associate Producer for the National Theatre in London until 2017 where he produced various screen productions of theatre productions, most recently My Country (2017). Since 2017 he has been Executive Producer for Wales Millennium Centre in Cardiff, Wales and Creative Producer for the NCPA Mumbai, India.
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.