Leah B. Silverthorn served as a CalChamber policy advocate from May 2018 to February 2022. She specialized in climate change, air quality, energy, environmental justice, marijuana/cannabis, and transportation and infrastructure issues. She brought to the CalChamber more than a 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. 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.