The GEO Group Australia Pty Ltd is an Australian company, responsible for the management of privatised prisons in Australia. Its head office is on Level 18 in the National Mutual Center in the Sydney CBD in the City of Sydney, Sydney, New South Wales."." GEO Group. Retrieved on 22 November 2010. "Head Office Level 18, National Mutual Center, 44 Market Street Sydney,New South Wales 2000 Australia ."