I received my B.Sc. degree in Engineering Physics (1978), and obtained my M.Sc. (1991) and Ph.D. (1995) in Hydrogeology from the Department of Material Science and Mineral Engineering, all from the University of California, Berkeley. My Ph.D. work involved the hydrologic characterization of heterogeneous geologic media using inverse methods based on iterated function systems (a fractal-generation technique), under the direction of Paul Witherspoon. I am currently a Staff Scientist in the Hydrogeology Group of the Energy Geosciences Division at E.O. Lawrence Berkeley National Laboratory. My research interests include development and application of techniques for analyzing well-log, well-test, and tracer data to infer the distribution of hydrologic properties in heterogeneous geologic settings, including fractured rock; mathematical modeling of multi-component, multi-phase fluid flow and transport in such systems; coordination of modeling studies with laboratory and field work; collaboration with geophysicists, geochemists, and geologists in interdisciplinary studies. Applications include the geologic storage of carbon dioxide and nuclear waste, groundwater and vadose-zone contaminant remediation, optimal utilization of geothermal and petroleum reservoirs, and design and analysis of aquifer and soil thermal energy storage systems.