Watershed hydrology, especially in areas of complex terrain; modeling the land-surface energy balance for determination of the spatial distribution and timing of snowmelt runoff; using numerical methods to solve geologic and hydrogeologic problems; GIS and remote sensing as tools for geospatial data analysis applied to geologic problems at all scales; scientific visualization

• A multiagency and multijurisdictional approach to map the glacial deposits of the Great Lakes Region in three dimensions
• A hydropedological approach to quantifying groundwater recharge in various glacial settings of the mid-continental USA
• Incorporation of the Penman-Monteith potential evapotranspiration method into a Palmer Drought Severity Index tool
• Spatially distributed regional recharge-rate estimation to guide an aquifer-sensitivity assessment for mid-continental glacial environments, USA
• A tool to estimate the Palmer Drought Severity Index using Penman-Monteith potential evapotranspiration at any spatial scale