In 2004 Garth completed a Bachelor of Applied Science in Environmental Management and Tourism with the University of Western Sydney, Australia. This was followed in 2005 with a Bachelor of Tourism (Honours Research) with first-class honours. He is currently a PhD candidate at the University of Western Sydney under the supervision of Associate Professor Robyn Bushell and Dr Russell Staiff.

In addition to research, Garth has been working with Tourism New South Wales (TNSW) since January 2005. TNSW is a state government agency responsible for tourism planning and marketing in the state of New South Wales, Australia.