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- 2011-present. Professor of Forest Soils and Nutrient Dynamics.
- 2007-2011. Associate Professor of Forest Soils and Nutrient Dynamics.
- 2001-2007. Assistant Professor of Forest Soils.
- 1999-2001. Research Assistant Professor and Associate Director, Hardwood Research Cooperative, North Carolina State University.
- 1996-1999. Lecturer in Forestry, Agronomy and Horticulture Group, Soil, Plant and Ecological Sciences Division, Lincoln University.
- 1995-1996. Postdoctoral Fellow (only a six-month stint). British Columbia Ministry of Forests, Vancouver Forest Region.
- 1993-1995. Teaching Assistant, University of British Columbia.
- 1991-1995. Research Assistant, University of British Columbia.
- 1990-1991. Visiting Graduate Student, University of Alberta.
- 1987-1989. Research Assistant, Chinese Academy of Sciences.
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