Dr. Jim Williams is an expert on the energy system and the energy transition and was an early leader in modeling the decarbonization of the energy system. He helps produce Evolved’s Annual Decarbonization Perspective (ADP) for the U.S., and was the lead author of the original report released in 2021 in AGU Advances. He is the founder of the Energy Systems Management program at the University of San Francisco, where he is a tenured professor, and he currently serves as the 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. 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.