Senior Hydrogeologist Erwin Melis, Ph.D. has been with JSAI since 2006. He holds a B.S. degree in Geology from University of Massachusetts at Amherst, a M.S. degree in Geology from the New Mexico Institute of Mining and Technology, and a Ph.D. in Structural Geology from University of Maine (Orono). He has been a registered Professional Geologist in California, since 2011 (CA-8870). His work includes hydrogeologic investigations, drilling and pumping test oversight, well sittings, spring characterization in the field and studying the influence of structural geology on groundwater flow. For recreation he enjoys hiking, sketching, and spending time with family.