John Craig's software controls several of the world's largest heliostat and photovoltaic sun-tracking fields, helps engineers design taller wind turbine towers, and enhances oil and gas production at the North Slope of Alaska. John holds a patent for a new way to track the sun, is the author of over a dozen computer programming books published by Microsoft and O'Reilly, and he's passionate about alternative energy. Contact John at john@johnclarkcraig.com.