With the Australian National Botanic Gardens from 1970, becoming Director of Visitor Services in the late 1980s. Also a member of the Executive of the Centre for Australian National Biodiversity Research (CANBR) and the Australian National Herbarium (a facility managed jointly by CSIRO and the Australian National Botanic Gardens).

In 2000 he moved to the Botanical Information Group of the Australian National Botanic Gardens to manage the electronic dissemination of botanical information and the image/photograph collection. He manages the content of the web site for the ANBG.

He has published a range of botanical-horticultural books in collaboration with John Wrigley, starting with 'Australian Native Plants' in 1979, now in its fifth edition. He has also published directories of Australian botanic gardens. Most recently he has published, with John Wrigley, a biological/social-history book on the eucalypts.

He has an extensive private collection of about 40,000 photographs of Australian plants, and manages the image collection for the ANBG.