In broad areas of hydrogeology and surficial processes, including geomorphology, geochemistry, and dating. Specific past or present projects include: Movement of sediments in aquifers, treatment of acid mine drainage, determination of the age of caves, determination of incision rates of surface streams, structural controls on carbonate aquifer development, effects of sea-level change on aquifer development, groundwater hydrology of metamorphic terranes, paleomagnetic dating of glacial deposits, and the occurrence of rare petroleum deposits.
Geographic areas include: Alabama, Ohio, Pennsylvania, Tennessee, Virginia, West Virginia, Kentucky, New Mexico, Maryland, Indiana, Puerto Rico, and Borneo.

2003 to Present 2002 2001 2000 1999 1998 Pre-1998