From 1993-2006, Gregory studied Biochemistry and Microbiology and then worked as a microbial ecologist at the University of Queensland (under the supervision of Prof. Linda Blackall), the University of New South Wales (with Prof. Staffan Kjelleberg’s at the CMBB). He also worked all-too-briefly with the awesome Agrigas team at the Department of Biotechnology at the University of Lund in Sweden.

In these roles, Gregory explored the identity and role of different microbes – particularly Bacteria and Archaea – from a range of environments, including: mouse intestines, stromatolites, seaweed. But mostly he researched the population dynamics of the bacteria involved in removing phosphate from wastewater (sewage).

In 2007, Gregory shifted from research to science education with CSIRO Education (2007-2011) and Friends of the Earth Emerging Technologies Project (2011-2013). Since 2008, Gregory began a long-term collaboration with artists Briony Barr and Jacqueline Smith in the art-science collective, Scale Free Network. In this capacity, Gregory has collaborated with other artists, including Natalie Jeremijenko, Liquid Architecture, Slow Art Collective, Eco Innovators, TAPE Projects and more.

Gregory now co-authors and co-publishes the Small Friends Books series and the Planet Human graphic novel series, along with Scale Free Network collaborator, Briony Barr.