Geoffrey Siemering is a researcher with the Department of Soil Science at University of Wisconsin in Madison. Beginning his work with UW-Madison in 2014, Geoff conducts research and develops outreach programming on soil contaminant issues at the interface of public health and environmental regulation. Recent projects include bioavailability of lead in urban soils, reuse of lead and zinc mine-scarred agricultural land, quantification of cheesemaking and vegetable processing facility wastewater soil denitrification, and determination of anthropogenic polycyclic aromatic hydrocarbon baseline values for urban Wisconsin. He also has experience with triad-approach monitoring of aquatic herbicide impacts, and radionuclide waste disposal. Prior to UW-Madison, Geoff worked for the San Francisco Estuary Institute and Lawrence Livermore National Laboratory. Since 2015, Geoff has contributed to ITRC's Bioavailability of Contaminants in Soil. Geoff earned a bachelor's degree in geochemistry from Pomona College, Claremont, California in 1994 and a master's degree in soil science from the University of California, Berkeley in 1999.