Sim Van der Ryn has been a teacher, writer, researcher, and practitioner of design for forty years. A leading authority on ecologically sustainable architecture and design, he is Emeritus Professor of Architecture at the University of California, Berkeley, where he has taught since 1961. As California's State Architect in the 1970s, he initiated landmark programs in energy-efficient building and environmentally appropriate technologies. His innovative designs for homes, sustainable communities, retreat centers, schools, and commercial buildings have received many awards and been widely published.