Dan Chiras is Director of the Center for Renewable Energy and Green building through which he teaches workshops solar electricity, wind energy, passive solar design, natural building, and green building. He is also president of Sustainable Systems Design, Inc., a company that installs residential solar electric and wind energy systems and consults on passive solar design, residential renewable energy, and green building throughout North America. Dan is the author of 32 previous books, including The Homeowner's Guide to Renewable Energy and Power from the Wind.