Dave was one of Mollison's early students and is considered a co-originator of permaculture.
"Consciously designed landscapes which mimic the patterns and relationships found in nature, while yielding an abundance of food, [fiber] and energy for provision of local needs. People, their buildings and the ways in which they [organize] themselves are central to permaculture. Thus the permaculture vision of permanent or sustainable agriculture has evolved to one of permanent or sustainable culture."