Thomas Mohr is Senior Hydrogeologist at the Santa Clara Valley Water District, where he manages groundwater monitoring programs and groundwater studies for a major indirect potable reuse project. His independent study of 1,4-dioxane began after the publication of the District’s Solvent Stabilizers White Paper in 2001, which generated many inquiries and dialogs and ultimately led to his six-year personal quest to prepare his book, “Environmental Investigation and Remediation: 1,4-Dioxane and Other Solvent Stabilizers” (Mohr, DiGuiseppi, Stickney; CRC Press, 2010). Mohr has published on the use of solid phase extraction for 1,4-dioxane analysis (now used in EPA Method 522), on perchlorate isotope forensic investigations, on cataloging and prioritizing investigation of past dry cleaner operations, on salt and nutrient management planning, on differentiating sources of nitrate using stable isotopes of water, and on one of the earliest applications of anaerobic bioremediation of gasoline compounds. He previously worked as Environmental Engineering Coordinator for the City of Sunnyvale, and Senior Hydrogeologist for the County of Yolo. Mohr was President of the Groundwater Resources Association of California in 2006 and 2007, and served as a Director on GRA’s Board for 10 years.