Leah Silverthorn is a senior policy advocate with the California Chamber of Commerce. She specializes in climate change, air quality, energy, environmental justice, marijuana/cannabis, and transportation and infrastructure issues. She brought to the CalChamber more than decade of legal experience in environmental, energy, and land use matters. Immediately before coming to CalChamber, she was the principal owner of Silverthorn Legal, based in Seattle, Washington. She focused on environmental litigation, contaminated property redevelopment, and environmental cost recovery and defense. Silverthorn has represented Fortune 500 companies and property owners against claims by U.S., Washington, Oregon, and California regional environmental entities, and is admitted in several states and federal appellate courts. Before entering private practice, Silverthorn was a staff attorney at the Indiana Department of Environmental Management Office of Legal Counsel, and has represented both private and not-for-profit clients on environmental issues across the United States. She is an honors graduate of Indiana University-Bloomington, with a B.S. in public affairs and environmental management. She earned her J.D., with honors, at the Indiana University McKinney School of Law, where she was articles editor for the Indiana International and Comparative Law Review and a member of the Moot Court Board.