Bill DiGuiseppi is a 30+ year experienced Principal Hydrogeologist with Jacobs in their Denver office. Bill is an expert in the history, occurrence and remediation of 1,4-dioxane and PFAS, and leads Jacobs Emerging Contaminants Community of Practice. Bill has been actively engaged with the ITRC PFAS Team as a co-leader of the Treatment Technologies writing subgroup (2017-2019) and an instructor on several PFAS topics since 2018. He has been invited as session keynote and luncheon speaker for international conferences in the US, Europe, and Australia. His enthusiastic support of ITRC earned him the 2018 Industry Member of the Year award. Bill is the Vice Chair for Emerging Issues for the SAME National Environmental Community of Interest (COI) and is a regular speaker for SAME national and Denver Metro Post events. Bill is also an adjunct faculty member in the Civil and Environmental Engineering Department at the Colorado School of Mines.