Daniel Hadley, PG, has worked at the Illinois State Water Survey (ISWS) as a research hydrogeologist since 2014. He conducts groundwater flow modeling projects to support long-term water supply planning, manages the ISWS’ groundwater monitoring network, and researches the hydrogeology of fault zones and geochemistry of the Cambrian-Ordovician aquifer system. He holds a B.S. in geology from Augustana College, an M.S. in geology from Northern Arizona University, and is currently working on his Ph.D. in geology at the University of Illinois.