Garry began playing guitar at the age of eleven and formed his first band, (Sludgepump), at fourteen while a student at Asquith Boys' High School, in Sydney, Sludgepump (subsequently known as Allied Harp) was also the first band of legendary bass player Ian Lees. Allied Harp performed at many school functions, but most notably, at hundreds of gigs in garages across Sydneys north. The high point of Allied Harp's career was their acclaimed supporting gig with Daddy Cool at the notorious Hornsby Dance.

In the early 1980's, Garry was the lead guitarist for the band Moving Pictures and co-wrote the song What About Me? In 1987, he formed the band 1927, which he quit in 1990.

Since the early 1990's, Garry has worked in various areas of the music industry, and has helped many artists and bands to obtain recording contracts with International recording companies. Garry has continued to write, achieving an Australian Songwriters Association Award for Children of the World in 2000.

He currently writes for television, for documentaries, and produces music for various artists. His song What about Me?, was released by Australian Idol finalist Shannon Noll and again reached the number 1 position on the ARIA charts with sales in excess of 200,000 units.

Garry's latest project is Mizair.