Dr. Johnson is a Professional Engineer with GSI Environmental. He earned B.S. and M.S. degrees in Civil Engineering from the University of California, Davis, and a Ph.D. in Civil Engineering from the University of California, Los Angeles. Dr. Johnson has over 8 years of experience in applied research and environmental consulting. Dr. Johnson has extensive experience in developing treatment strategies for addressing environmental media contaminated with persistent contaminants such as petroleum hydrocarbons, volatile organic compounds (VOCs), 1,4-dioxane, and per- and polyfluoroalkyl substances (PFAS). Additionally, Dr. Johnson has extensive experience with applied research involving both adsorption and biodegradation for developing treatment technologies (e.g., colloidal gas aphrons) for treating water contaminants, including PFAS, 1,4-dioxane, and chlorinated volatile organic compounds (CVOCs). Dr. Johnson’s project experience includes site investigation and remediation; assessment of treatment alternatives for groundwater, soil, and drinking water; permitting; and litigation support for a variety of environmental contaminants including PFAS.