Dr. Johnson is an environmental engineer with GSI who has expertise in adsorption and biodegradation treatment technologies for addressing water impacted by emerging contaminants. He received an M.S. in Civil & Environmental Engineering from the University of California, Davis, and a Ph.D. in Civil and Environmental Engineering from the University of California, Los Angeles. Dr. Johnson has over 5 years of experience performing research and development for biofilm-based and treatment train remedial strategies for emerging contaminants. Dr. Johnson has published numerous papers in the areas of adsorption, biodegradation, treatment train development for addressing water contaminated with recalcitrant environmental contaminants, including 1,4-dioxane, chlorinated volatile organic compounds (CVOCs), and per- and polyfluoroalkyl substances (PFAS). Additionally, Dr. Johnson has prepared numerous reports and proposals for project sponsors and stakeholders, including the final report for Strategic Environmental Research and Development Program (SERDP) Project ER-2300, “In Situ Biodegradation of 1,4-Dioxane: Effects of Metals and Chlorinated Solvent Co-Contaminants.”