 A front-rower, Cusack was one of the last remaining top level league players to hold a job outside football, working part-time as a plumber.He played in the 2000 NRL Grand Final loss to the Brisbane Broncos.Cusack was awarded the 2002 Sydney Roosters season's "Clubman of the Year" and played in their 2002 NRL Grand Final victory over the New Zealand Warriors.