David Fellenz is a hydrogeologist with the DOE Oversight Bureau in Los Alamos, New Mexico. His research interests include groundwater chemistry, fate and transport of contaminants, and groundwater hydrology. Mr. Fellenz holds a BA in Geology from Lawrence University in Appleton, WI. Mr. Fellenz has seven years of experience in hydrology, including conducting site investigations and detailed groundwater sampling at Los Alamos National Laboratory.