Katherine O’Brien is a Senior Attorney with the Toxic Exposure and Health Program. Katherine engages in litigation and regulatory advocacy to protect people and wildlife from dangerous exposures to petrochemicals, PFAS, and other toxic chemicals. Before joining the Toxic Exposure and Health Program, Katherine was an attorney in Earthjustice’s Northern Rockies Office.

Katherine graduated with honors from the University of Washington School of Law, where she was a Gates Public Service Law Scholar and Editor-in-Chief of the Washington Law Review. Before joining Earthjustice in 2013, Katherine clerked for Judge Sidney Thomas on the U.S. Court of Appeals for the Ninth Circuit.