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Giese was Foundation President and life member of numerous community service and sporting organisations, including the Royal Life Saving Society Australia (NT), Darwin Probus Club, Darwin Disaster Welfare Council after the 1974 destruction of Cyclone Tracy, and the Institute of Public Administration.
In his role as governor, McCusker and his wife serve as the patron for a number of organisations and events, including the Perth International Arts Festival, Telethon, and the West Australian Ballet, and the Western Australian branches of Anglicare, the Royal Flying Doctor Service, the Royal Life Saving Society, the RSPCA, and St. John Ambulance.