Geoff Crosby started his architectural journey at the University of Melbourne, working for renowned architect Guilford Bell during vacations, before leaving in 1977 to study painting.

In 1980 he became a founding member of the Australian rock band Hunters & Collectors. He toured both in Australia and overseas, recording five albums (two in Germany) and living in London for six months. Geoff left the band in 1985 to direct music film clips and to continue  painting.

In 1987 he established Geoff Crosby Design and in 1992 he graduated in architecture from the Royal Melbourne Institute of Technology. His first projects, which honed his design skills, were residential: renovations, additions and small houses. For a short while he collaborated with designer Chris Connell on a number of retail and hospitality projects.

In 1993 he founded Green City Homes to franchise the construction of project homes for the mass housing market. He developed ten prototype designs for energy-efficient houses, working with the Australian Conservation Foundation and Energy Victoria. Unfortunately this project did not progress but it did ignite a passionate and ongoing commitment to sustainable design.

In 1994 he established CROSBY architects. Four years later he moved into larger scale work, though still with a focus on housing. From 2000 to 2004 he was a design director of AXIA Architects, designing residential and commercial projects and refurbishments in Melbourne and Sydney.

In 2001 Geoff relocated to Footscray where he became an active member of the community, involved in a variety of causes from Save the Footscray Pool to the Footscray Reference Group. With his partner, artist Nicola Loder, he set up Short Street Studios in 2002. In 2004 Short Street Art Space was established to exhibit young and emerging artist.

In 2005 Geoff left Axia Architects to establish CROSBY architects studio in central Footscray.

In 2006 Short St Art Space & Studios closed.

In 2010 CROSBY architects moved to regional Victoria setting up a studio in the town of Castlemaine, located just over an hour north west of Melbourne, where he continues his work in sustainable and community based architecture.