Education

B.A.     Biology         St. Louis University               June 1973
M.S.     Biology        University of Houston            June 1976
Ph.D.    Botany         Brigham Young University     December 1979
 

Professional Experience
 

1994-now	Regents Professor and TAES Faculty Fellow, Department of Ecosystem Science and Management, Faculty of Molecular and Environmental Plant Sciences, and Program in Ecology and Evolutionary Biology, Texas A&M University, College Station, Texas.
1987-1994	Associate Professor, Department of Rangeland Ecology and Management, and Faculty of Molecular and Environmental Plant Sciences, Texas A&M University, College Station, Texas.
1985-1987	Assistant Professor, Department of Pediatrics, Baylor College of Medicine and USDA Children's Nutrition Research Center, Houston, Texas.

1983-1985	Instructor, Department of Pediatrics, Baylor College of Medicine and USDA Children's Nutrition Research Center, Houston, Texas.
1982-1983	Postdoctoral Fellow, Department of Pediatrics, Baylor College of Medicine and USDA Children's Nutrition Research Center, Houston, Texas.
1980-1982	Postdoctoral Fellow, Department of Biology, Augustanta College, Sioux Falls, South Dakota.

Honors and Awards

Regents Professor, Texas A&M University System, 2006
Outstanding Graduate Professor, Department of Rangeland Ecology and Management, 2006
Leu Distinguished Lecturer, Center for Grassland Studies, University of Nebraska, 2004
Outstanding Achievement Award, Society of Range Management, 2004
Faculty Fellow, Texas Agricultural Experiment Station, 2003
Best Poster, Forest and Rangeland Soils, Soil Sience Society of America Meeting, 2002
Fellow, Soil Science Society of America, 2001
Fellow, American Society of Agronomy, 2001
Most Effective Graduate Course, Texas A&M University, 2000 and 2002
Stapledon Lecturer, Institute for Grassland and Environmental Research, Exeter, UK, 1999
Royal Society of Chemistry Lecturer, 1997 and 1999
Editor's Citation for Excellence, Soil Science Society of America Journal, 1994
Sigma Xi Outstanding Dissertation of the Year, Brigham Young University, 1980
Julia Greenwell Award, Brigham Young University, 1977 and 1979
 

Recent Professional Activities

Director, Stable Isotope Biogeochemistry Laboratory, Department of Rangeland Ecology and Management, Texas A&M University. Lab consists of 3 isotope ratio mass spectrometers, 2 elemental analyzers, and ancillary sample preparation equipment. Laboratory research programs supported by NSF, DOE, USDA, NASA, and US/Israel BARD since 1988.

Advisory Panel Member, National Science Foundation, Washington, D.C., 2008-present.

Faculty Mentor, Sloan Foundation Minority Ph.D Fellowship Program, 2007-present.

Visiting Scholar, Department of Earth and Atmospheric Sciences, Purdue University, 2006.

Session co-organizer and co-chair, "Ecosystems in Flux: Molecular and Isotopic Assessments of Soil Organic Matter," annual meeting of the American Geophysical Union, 2004.

Invited participant, U.S. Climate Change Science Program, Ecosystems Workshop, Silver Spring, Maryland, February 2004.

Session co-chair, “Ecosystems in Flux: Isotopes as Indicators of Ecosystem Change,” annual meeting of the American Geophysical Union, 2003.

Associate Editor, Soil Science Society of America Journal, 1999-2002.

Advisory Panel Member, NSF Directorate for Biological Sciences, National Science Foundation, Washington, D.C., 2001-2003.

Invited participant, 9th US-Japan Workshop on Global Climate Change, Tokyo, October 2001.

Invited participant, NSF National Ecological Observatory Network (NEON) Workshop and Symposium, San Diego Supercomputer Center and University of California at San Diego, March 2000.

Keynote speaker, British Stable Isotope/Mass Spectrometry Users Group (Exeter, UK, January 1999). "Stable isotopes in ecosystem science."

Invited seminars at: Rothamsted Experiment Station (Harpenden, UK), Robert Gordon University (Aberdeen, UK), Macaulay Land Use Research Institute (Aberdeen, UK), International Centre of Insect Physiology and Ecology (Nairobi), Kenyatta University (Nairobi), Instituto de Nutricion de Centro America Y Panama (Guatemala City), University of Saskatchewan, University of Alberta, University of Texas, Purdue University, Oregon State University, University of Texas at San Antonio, Baylor University, University of Nebraska, Southwest Texas State University, USDA Beltsville, USDA Miles City, USDA Temple.