Nathaniel Warner is an Assistant Professor at The Pennsylvania State University in the Civil and Environmental Engineering Department. Dr. Warner received his Ph.D. in Earth and Ocean Sciences from Duke University. His research focuses on understanding the processes controlling sources of salts in shallow groundwater and surface water using inorganic isotope tracers. His field areas have included Morocco, Nepal, and the United States. Dr. Warner also investigates novel treatment technologies to treat high salinity waters such as oil and gas-produced water.