Education:

• B.A. Chemistry, Southern Illinois University, Carbondale,IL
• M.S.Geology, University of Colorado, Boulder, CO 
• Ph.D. Geochemistry, Stanford University, Stanford, CA

Research Interests:

• Chemical Modeling of Natural Waters  (especially trace elements and redox chemistry)

• Geochemistry of Acid Mine Drainage 

• Groundwater Geochemistry in Crystalline Bedrock 

• Analytical Methods for Major, Minor, Trace and Redox Species

• Evaluation of Thermodynamic Data

• Geochemistry of Radioactive Waste Disposal

Contact information:

U.S. Geological Survey

3215 Marine St., Suite E127

Boulder, CO 80303

phone: (303) 541-3037

fax: (303) 447-2505

email:  dkn@usgs.gov

• B.A.   Science, University of Denver, Denver,CO
• Ph.D.  Hydrology, University of Arizona, Tucson, AZ

• Analytical methods for environmental isotopes, major, minor, trace and redox species
• Application of variations in transition metal isotope abundances to geochemical interpretations
• Application of reactive transport models to contaminant transport in surface waters
• Application of geochemical models to interpreting low-temperature aqueous processes

Contact information:

U.S. Geological Survey

3215 Marine St., Suite E127

Boulder, CO 80303

phone: (303) 541-3035

fax: (303) 447-2505

email:  jwball@usgs.gov

• B.S. Geology, Tufts University, Medford, MA
• M.S. Geology, Oregon State University, Corvallis, OR
• Ph.D. Geological Sciences, University of Colorado, Boulder, CO

• Application of trace element and radiogenic isotopic systematics to identify processes controlling water-rock interaction

• Determination of pre-mining baseline water quality in mining-affected watersheds

• Fate and transport of metals in the alpine weathering environment

• Rare earth element geochemistry of acid waters

• Processes controlling the formation and preservation of ferricrete

Contact information:

U.S. Geological Survey

3215 Marine St., Suite E127

Boulder, CO 80303

phone: (303) 541-3080

fax: (303) 447-2505

email:  plv@usgs.gov

• B.S.  Biochemistry, College of Charleston, Charleston, SC
• M.S.  Environmental Studies, University of Charleston / Medical University of South Carolina

• Analytical methods for the determination of major, minor, trace and redox species in environmental samples
• Geochemical and microbial process effecting the distribution of redox species
• Analytical method development
• Application of geochemical models

Contact information:

U.S. Geological Survey

3215 Marine St., Suite E127

Boulder, CO 80303

phone: (303) 541-3079

fax: (303) 447-2505

email:  rbmccles@usgs.gov