1. Research Graduate Assistant II, Department of Plant Science and Landscape Architecture, University of Maryland, College Park 20742
2. Graduate Research Assistant, Department of Plant, Soil, and Microbial Sciences, Michigan State University, East Lansing 48824
3. Associate Professor
4. Professor, Department of Entomology and Plant Pathology, North Carolina State University, Raleigh 27695
5. Assistant Professor, Department of Plant Science and Landscape Architecture, University of Maryland, College Park 20742