Donald Kiffmeyer is a trained fireman who has been involved in the construction industry for the last 20 years, specializing in affordable, low-tech, low-impact building methods that are as natural as possible. Together with his partner Kaki Hunter, he co-developed over the last nine years the "Flexible Form Rammed Earth Technique" of building affordably with earthbags and has taught the subject and contributed his expertise to several books on natural building.