Chris Gellasch is an Army Environmental Science and Engineering Officer and currently assigned as an assistant professor in the Department of Preventive Medicine and Biometrics at the Uniformed Services University of the Health Sciences in Bethesda, Maryland. He received his Ph.D. in Hydrogeology from the University of Wisconsin-Madison, his M.S. in Geology from Indiana University, and his B.S. in Geology from Eastern Michigan University. His current research combines aspects of hydrogeology and environmental engineering to determine the most likely pathways for sewer derived wastewater contaminants to migrate through the subsurface and impact public supply wells. combines aspects of hydrogeology and environmental engineering to determine the most likely pathways for sewer derived wastewater contaminants to migrate through the subsurface and impact public supply wells.