Director, Penn State Extension; Associate Dean, College of Agricultural Sciences
Professor of Ecosystem Science and Managment
Associate Research Professor
Associate Professor of Entomology
Professor of BiologyPopulation Genetics and Genomics of Chromosomal Rearrangements in Drosophila
Distinguished Professor of Entomology and Chemical Ecology
Professor of Turfgrass Breeding and GeneticsPopulation genetics. Plant evolution and ecology. Crop improvement. Physiological tolerance to biotic and abiotic stress.