Dr. Williams currently serves as an Associate Professor at the University of San Francisco and Director of the Deep Decarbonization Pathways Project (DDPP), a consortium of research teams convened at the request of the United Nations Secretary General and led by the Sustainable Development Solutions Network (SDSN) and the Institute for Sustainable Development and International Relations (IDDRI). Dr. Williams has consulted on many aspects of energy planning and regulation for government, utility, and industry clients. In 2007, he led an analysis for the state of California on greenhouse gas (GHG) reduction strategies, which became a key input into implementation of Assembly Bill 32, the state’s groundbreaking climate policy. He was lead author of a widely-read 2012 article in Science that analyzed California’s options for reducing GHGs 80% below 1990 levels by 2050. In 2014, he led a research team from Energy and Environmental Economics, Inc., Lawrence Berkeley National Laboratory, and Pacific Northwest National Laboratory that conducted a similar analysis for the whole U.S. A Mandarin speaker, He received his B.S. in Physics from Washington and Lee University, and his M.S. and Ph.D. in Energy and Resources from U.C. Berkeley.