David Holmgren is an Australian environmental designer and one of the co-originators of the concept of permaculture. He developed this sustainable agricultural system in the 1970s alongside Bill Mollison. Holmgren's work focuses on creating ecological and sustainable living practices that integrate land use, agriculture, and community. In addition to his contributions to permaculture, Holmgren has authored several books and articles on sustainable living and design. He emphasizes the importance of local solutions to global challenges, advocating for a shift towards more resilient and self-sufficient communities. His ideas have influenced many in the fields of ecology and sustainable development.