Geoffrey is a professor of Neurology at The University of Melbourne, co-chairs the Mobile Stoke Unit Program, and is a former Director of The Florey Institute of Neuroscience and Mental Health. He is the co-lead of the Australian Stroke Alliance and the Frontiers MRFF grant. His research interest is clinical stroke management. He was co-founder, with Professor Stephen Davis, of the Australian Stroke Trials Network. He is the co-chair of the EXTEND group of trials, including the recently published EXTEND IA trial of thrombectomy in acute ischaemic stroke. He was Editor-in-Chief of the International Journal of Stroke and is Past President of the World Stroke Organization.