David Holmgren David Holmgren Permaculture One in 1978 Permaculture One in 1978 Permaculture One in 1978 http://holmgren.com.au/about-permaculture/#lightbox/1/ Permaculture One in 1978 www.Holmgren.com.au Bill Mollison and David Holmgren described permacultural principles About Permaculture / Holmgren.com.au.