David Yoxtheimer (P.G.) is a hydrogeologist and extension associate with Penn State University’s Marcellus Center for Outreach and Research and serves as a liaison to advise stakeholders on key environmental issues. He earned his B.S. in Earth Science from Penn State, where he is currently completing his Ph.D. in Geosciences. Previous to joining MCOR he spent 18 years as a consulting hydrogeologist with expertise in water supply development, karst hydrogeology, geophysical surveying, environmental permitting, shale energy geology, and integrated water resource management. Dave is also a hydrogeology instructor at Penn State and was recently appointed by Governor Wolf to be a voting member of the Pennsylvania Department of Environmental Protection’s Oil and Gas Technical Advisory Board.