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- Assistant Professor and Postharvest Extension Specialist
- University of Georgia
- Professor
- University of Florida
- Professor & Plant Pathologist
- University of California - Riverside
- Associate Professor of Teaching
- University of California - Davis
- Associate Professor of Cooperative Extension in Community Food Safety
- University of California - Davis
- Professor of Cooperative Extension in Subtropical Horticulture
- University of California - Riverside
- Department Vice-Chair; Associate Professor of Cooperative Extension in Small Scale Fruit & Vegetable Processing
- University of California - Davis
- Distinguished Professor and Professor of Cooperative Extension in Consumer Quality and Postharvest Technology
- University of California - Davis