| Scott Dane (Department: Penn State Institutes of Energy and the Environment) • PASDA, GIS Data Manager |
| Ken Davis (Department: Meteorology) • Professor of Meteorology |
| Donald Davis (Department: Plant Pathology) • Professor of Plant Pathology |
| Rick L. Day (Department: Crop and Soil Sciences) • Associate Professor of Soil Science and Environmental Information Systems |
| Chitrita DebRoy (Department: Veterinary and Biomedical Sciences) • Director E. coli Reference Center |
| Dennis Decoteau (Department: Horticulture) • Professor of Horticulture and Plant Ecosystem Health |
| Peter Deines (Department: Geosciences) • Professor Emeritus of Geochemistry • Associate Head, Graduate Programs |
| Curtis J. Dell (Department: Pasture Systems and Watershed Management Research Unit) • Soil Scientist |
| Ali Demirci (Department: Agricultural and Biological Engineering) • Assistant Professor of Agricultural Engineering |
| Consuelo DeMoraes (Department: Entomology) • Associate Professor of Entomology |
| Brian Dempsey (Department: Civil and Environmental Engineering) • Professor of Environmental Engineering |
| Claude dePamphilis (Department: Biology) • Professor of Biology |
| James Detwiler (Department: Other) • Instructor, World Campus GIS Certificate Program • Part-time GIS Analyst, Penn State's Population Research Institute |
| David DeWalle (Department: School of Forest Resources) • Professor Emeritus of Forest Hydrology |
| Erick D. DeWolf (Department: Plant Pathology) • Assistant Professor of Plant Pathology |
| Duane Diefenbach (Department: School of Forest Resources) • Adjunct Associate Professor of Wildlife Ecology • Unit Leader, Pennsylvania Cooperative Fish and Wildlife Research Unit |
| Kevin Dressler (Department: Penn State Institutes of Energy and the Environment) • Coordinator, Susquehanna River Basin Hydrologic Observing System |
| Patrick Drohan (Department: Crop and Soil Sciences) • Assistant Professor of Pedology |
| Chris Duffy (Department: Civil and Environmental Engineering) • Professor of Civil Engineering |
| Sjoerd W. Duiker (Department: Crop and Soil Sciences) • Associate Professor of Soil Management and Applied Soil Physics |
| James W. Dunn (Department: Agricultural Economics and Rural Sociology) • Professor of Agricultural Economics |