From 2012 to 2018, Bill Weihl was director of sustainability at Facebook. He built a team that 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 drove cross-industry collaborations, including playing critical roles in RE100 and the Renewable Energy Buyers Alliance. Prior to Facebook, Bill was green energy czar at Google, where his team pioneered Google’s work to buy clean energy for its data centers, and helped found the Climate Savers Computing Initiative with Intel and WWF. In 2009, he was honored by Time Magazine as one of their Heroes of the Environment in recognition of the work he and his colleagues did at Google, in 2016 he was honored with the Global Green Award for environmental leadership, and in 2018 he was honored by GreenBiz with the VERGE Vanguard Award.