Professor Green is a landscape architect and a Fellow of the American Society of Landscape Architects (ASLA). From 2001 to 2006 he headed up the Faculty of Architecture Building and Planning's Landscape Architecture Program. In 2011-2012 he served as an executive member of the Melbourne Sustainable Society Institute (MSSI). Prior to joining the University in 1999, he was with the Australian Housing and Urban Research Institute (AHURI). Prior to focusing on research he spent 12 years in landscape architectural practice, with projects in the United States, Mexico, South East Asia and Australia. His academic research is multidisciplinary and concerned with environment-behaviour issues related to land development and conservation, climate change and the health benefits associated with human contact with nature in urban settings.
The design for the new Royal Melbourne Children's Hospital was based on a design framework he developed. He is the author of Coastal Towns in Transition: Local Perceptions of Landscape Change (2010) and co-author of Towards Low Carbon Cities in China (forthcoming), The Green City: Sustainable Homes, Sustainable Suburbs (2005) and Design for Change (1985). His work has also appeared in various landscape architecture, urban planning and environmental psychology journals.