Bill Weihl is Director of Sustainability at Facebook. His group directs work on sustainability and energy efficiency across the company, driving projects to track and reduce the company's environmental footprint in all aspects of its operations. They also work with other companies to scale the deployment of renewable energy. Prior to Facebook, Bill was Green Energy Czar at Google. Earlier in his career, he was a Professor of Computer Science at MIT, a researcher at Digital's Systems Research Center, and CTO of Akamai Technologies.