Also studies long-lived radionuclides in natural samples, such as meteorites, ground water, ocean sediment and surface rocks. Is a former hydrologist for U.S. Geological Survey in radioactive waste disposal and former geologist and hydrologist for South Dakota State Geological Survey in ground-water supply studies. Served as a consultant to numerous state and federal agencies and has investigated landfills and ground water for contamination. Is former director of Indiana Water Resources Center. On editorial boards for the journals Water Resources Research and Transport in Porous Media.
Research is directed toward the impact of land development on local hydrology.
Has developed a new technique for land use planners to use in estimating the long-term effect of new development projects on ground water supplies.