Ph.D. 2001:-- Colorado State University, Fort Collins, CO. Environmental Soil Quality/Chemistry. Dissertation Title: Phosphorus adsorption/desorption of water treatment residuals and biosolids co-application effects.
M.S. 1992:-- Colorado State University, Fort Collins, CO. Soil Chemistry/Fertility. Thesis Title: Determination of salinity threshold levels for selected grass and legume forage species.
B.S. 1989:-- University of Delaware, Newark, DE. Plant Science - Agronomy. Minor: Microbiology.
2007-present: Research Soil Scientist/Soil Chemist, USDA-ARS, Northwest Irrigation and Soils Research Laboratory, Kimberly, ID.
2002-2007: Assistant Professor, Environmental Soil Quality/Chemistry, Department of Soil and Crop Sciences, Colorado State University, Fort Collins, CO.
1991-2002: Research Associate, Department of Soil and Crop Sciences, Colorado State University, Fort Collins, CO.
Professional Societies and Activities:
American Society of Agronomy
Soil Science Society of America
Division A5 Representative to the American Society of Agronomy Board of Directors, 2011-2013.
Guest Associate Editor, Journal of Environmental Quality, 2010-2011.
Division A5 Chair, Young Scientist Award Committee, 2010.
Soil Science Applied Research Award Committee, 2009-2010, Soil Science Society of America.
Division A5 chair -- Environmental Quality, 2009, American Society of Agronomy.
Division A5 chair elect -- Environmental Quality, 2008, American Society of Agronomy.
Graduate Student Research Poster Division A5 Symposium Contest Judge, 2009, American Society of Agronomy Meetings. Pittsburgh, PA.
USDA-CSREES NRI Soil Processes Panelist, 2008.
Presiding Officer, A5 Oral Session, Effects of Manure and Biosolids on the Environment, 2007, American Society of Agronomy Meetings. New Orleans, LA.
Undergraduate Research Poster Symposium Contest Judge, 2007, American Society of Agronomy Meetings. New Orleans, LA.
Presiding Officer, S11 Oral Session, Phosphorus Availability and Mobility in Land Applied Wastes, 2006, American Society of Agronomy Meetings. Indianapolis, IN.
Undergraduate Research Poster Symposium Contest Judge, 2006, American Society of Agronomy Meetings. Indianapolis, IN.
Presiding Officer, A5 Oral Session, The Effects of Waste Constituents on Soil and Water, 2005 American Society of Agronomy Meetings. Salt Lake City, UT.
Chair Soil Science Professional Service Award committee, November 2004 through November 2005. Soil Science Society of America.
Soil Science Professional Service Award committee, November 2003 through November 2004. Soil Science Society of America.
Outstanding Achievements and Recognitions
US EPA National Clean Water Act Recognition Award for Outstanding Biosolids Research, 2005.
Rocky Mountain Water Environment Association State of Colorado Analytical Award of Merit, 2005.
First place in the EPA 2003 Clean Water Act National Recognition Awards for Biosolids Exemplary Management for Operating Projects > 5 DMTD.
Association of Metropolitan Sewerage Agencies National Environmental Achievement Award in Research & Technology, 2000.
US EPA Wastewater Management Research Excellence Award, First Place, 1999.
Rocky Mountain Water Environment Association - State of Colorado Biosolids Management Merit award, 1998.
Expertise and Scientific Interests
Nitrogen and Phosphorus biogeochemical cycling.
Soil trace and heavy metal mobility, transformations, and fate.
Utilization of waste materials for beneficial reuse in agroecosystems, disturbed rangelands, mined land reclamation, burned areas.
Current Research Highlights
Biochar effects on soil chemistry, fertility, microbiology, crop growth, and environmental quality.
Biochar sorption of heavy metals: quantification and sorption mechanisms.
The effect of dairy lagoon waste effluent on calcareous soil copper chemistry and crop growth.
Changes in soil nitrogen, phosphorus, and carbon chemistry within irrigation systems.
The effect of clinoptilolite (zeolite) on soil nitrogen dynamics, water holding capacity, and crop growth.
Phosphorus sorption by alum-based water treatment residuals.
A fully-searchable listing of publications since 2008 is on our local repository.