David B. Wahl
United States Geological Survey
345 Middlefield Road
Menlo Park, California 94025

David Wahl is a Research Geographer at USGS and an Adjunct Professor in the Geography Department at UC Berkeley.  Dave earned his B.A. at Cal Poly San Luis Obispo and an M.A. and Ph.D. from UC Berkeley.  He is currently a Project Chief for the Tephrochronology project, using EMP analysis to determine the chemical composition of tephra from across the Western US and Central America.  Dave also works with the Pacific Holocene Climate project reconstructing Holocene vegetation change and climate variability using a wide suite of proxy analyses, including pollen, stable isotopes, charcoal and magnetic susceptibility.  His fieldwork includes sites in remote reaches of Peten, Guatemala, the Ruby Mountains in Nevada, the Coast Ranges in California, and Palmyra Atoll, a remote, uninhabited island in the central Pacific.