Paul Fenter received a B.S. in Physics at the Rensselaer Polytechnic Institute in 1984, and a PhD in Physics from the University of Pennsylvania in 1990. He then worked at Princeton University, first as a post-doctoral fellow and then as a research staff member. He joined the staff at Argonne National Laboratory in 1997 where he uses and develops a range of synchrotron X-ray scattering techniques (e.g., X-ray reflectivity, X-ray standing waves, resonant X-ray reflectivity, interfacial X-ray microscopy) to probe the structures and processes at solid-liquid interfaces through direct in-situ observations. His interests range from mineral-water interfaces in geochemical systems, electrical double-layer structure (e.g., in water, ionic liquids), as well as interfaces in electrical energy storage systems. He is a senior physicist and group leader for Interfacial Processes in the Chemical Sciences and Engineering Division. He has served, since 2014, as Director of the Center for Electrochemical Energy Science a DOE-funded Energy Frontier Research Center. He is a Fellow of the American Physical Society and the winner of the 2012 Bertram E. Warren Diffraction Physics Award from the American Crystallographic Association.