Ann S. Maest is an aqueous geochemist with expertise in the fate and transport of natural and anthropogenic contaminants in groundwater, surface waters, and sediments. The results of Dr. Maest’s research have been published in books and in peer-reviewed journals, including Applied Geochemistry, Chemical Geology, Applied and Environmental Microbiology, and Environmental Science and Technology. Formerly, Dr. Maest was an independent environmental consultant specializing in water quality impacts of hard rock mining, transport of toxics in groundwater and surface waters, and drinking water quality. As a senior scientist at Environmental Defense Fund, Dr. Maest was responsible for designing technical and policy approaches to minimizing releases of toxic substances from mining and manufacturing facilities. She was a research geochemist in the U.S. Geological Survey’s National Research Program where she conducted research on metal-organic interactions, metal and metalloid speciation, and redox geochemistry at a variety of surface water and groundwater sites around the country.