After taking a degree in English at the University of Queensland, Geoffrey travelled to Paris in 1975 to study at the Jaques Lecoq School of Mime, Movement and Theatre. On his return to Australia he played the Fool opposite Warren Mitchell's King Lear and co-starred with roommate Mel Gibson in Waiting for Godot. He was a principal member of Jim Sharman's pioneering Lighthouse ensemble in the early 80s, where he played leading roles in numerous classics.

As a theatre director, Geoffrey has staged productions for the Queensland Theatre Company, the Adelaide Festival, Company B Belvoir, and Magpie Theatre for Young People, for which he served as director for two years. Geoffrey has also staged his own co-adaptation of Aristophanes' Frogs.