Geoff specialised in solar (PV) energy in the final year of his electrical engineering degree in 1981. In 1987 he joined BP Solar Australia as an engineer. In 1989 he started his own company on the south coast of NSW where he designed, installed and maintained off grid power systems. 1995-2000 he worked as a consultant with an electricity utility involved with designing and installing off-grid and grid connected systems. In 1998 he was one of the co-founders of Global Sustainable Energy Solutions Pty Ltd (GSES). GSES is a multi-disciplinary organisation specialising in professional engineering and training services across the Renewable Energies sector. Geoff has undertaken projects in Australia, Africa, Asia and the Pacific islands and travels extensively. He was a part-time senior lecturer at the UNSW School of PV and RE Engineering from 2003 to 2015. Geoff is a member of many committees including Australian standards , IEC TC 82 and training.