Geoffrey is the Victorian Government Architect, having previously been the inaugural Western Australian Government Architect.

He has served on and acted as chair of many architectural design award and competition juries. In his role as Victorian Government Architect London advises the government on key architectural projects and is an advocate for high quality architecture across the state.

He is also the Winthrop Professor of Architecture at The University of Western Australia. He is a past Dean and Head of School at UWA, and Professorial Fellow at The University of Melbourne. He was the President of the Western Australian Chapter of the Australian Institute of Architects and is a Life Fellow of the Institute. He is a past member of the Australian Research Council's College of Experts and has acted as a consultant on numerous architectural and urban design projects.