I received my undergraduate degrees in Classics and Hydrology from the University of Virginia and my masters (1985) in water resource systems and doctorate (1988) in hydrogeology from Purdue University Civil Engineering. Before joining the UCD faculty in 1996, I was employed as a senior research scientist at Battelle’s Pacific Northwest National Laboratory PNNL in Richland, Washington.

I have been involved in quantitative analyses of reactive transport of multiphase, multicomponent mixtures with inorganic, organic, and biotic components in natural and engineered environments. My areas of specialization include contaminant hydrogeology, groundwater age and isotope-based recharge estimation, microbial-induced calcite precipitation, upscaling multicomponent reactive transport in heterogeneous porous media, in situ bioremediation, subsurface bacterial transport and colloid filtration theory, modeling microbial and macrobial population dynamics and ecotoxicology, multiphase diffusive mass transfer, disinfection of particle-associated bacteria,  inverse problems, and multimedia risk assessment for now/ alternative fuels and chemicals.  Funding for my research group comes from NSF, DOE, and CA State regulatory agencies.  My lab includes undergraduate and graduate researchers and visiting scholars from collaborating institutions (most recently Technical Univ. Crete, Greece; Univ. Ljubljana, Slovenia; Geosciences Rennes, France; CSIRO, Australia; and Royal Institute of Technology, Sweden).  I teaches classes in  quantitative geochemistry, environmental fate and transport, hydrogeology, inverse problems, and probability and statistics.

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