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 co-authored the definitive book on 1,4-dioxane with Tom Mohr, Janet Anderson, and Jim Hatton. He frequently conducts 1,4-dioxane and PFAS training for a variety of groups, including the US EPA, the US DOD, the US DOE and the Society of American Military Engineers (SAME). Bill has been actively engaged with the ITRC 1,4-Dioxane Team, as the history and use writing subgroup co-lead. Bill has also been an instructor on emerging contaminants topics for ITRC for several years. His enthusiastic support of ITRC earned him the 2018 Industry Member of the Year award. Bill is also an adjunct faculty member in the Civil and Environmental Engineering Department at the Colorado School of Mines.