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.