He has been President of both the New South Wales and Australian Bar Associations. Gyles was a Judge of the Federal Court of Australia from 1999 to 2008 and then an Acting Judge of the Court of Appeal of the Supreme Court of New South Wales.
Gyles has been President of both the New South Wales and Australian Bar Associations. He served as a judge for the Federal Court of Australia from 1999 to 2008, then held an acting position on the Court of Appeal of the Supreme Court of New South Wales.