| Ed Rajotte (Department: Entomology) • Professor of Entomology |
| Asok Ray (Department: Mechanical and Nuclear Engineering) • Distinguished Professor of Mechanical Engineering • Graduate Faculty of Electrical Engineering • Graduate Faculty of the Inter-College Program in Materials |
| Charles Ray (Department: School of Forest Resources) • Assistant Professor of Wood Products Operations |
| Andrew Read (Department: Biology) • Professor of Biology and Entomology • Eberly College of Science Distinguished Senior Scholar |
| Richard C. Ready (Department: Agricultural Economics and Rural Sociology) • Assistant Professor of Agricultural and Environmental Economics |
| C. Channa Reddy (Department: Veterinary and Biomedical Sciences) • Distinguished Professor of Veterinary Sciences |
| Patrick Reed (Department: Civil and Environmental Engineering) • Associate Professor of Civil Engineering |
| John (Jay) Regan (Department: Civil and Environmental Engineering) • Associate Professor of Environmental Engineering |
| Raymond Regan (Department: Civil and Environmental Engineering) • Professor Emeritus of Environmental Engineering |
| Thomas Richard (Department: Agricultural and Biological Engineering) • Director, Penn State Institutes of Energy and the Environment • Associate Professor of Agricultural and Biological Engineering |
| David Riley (Department: Architectural Engineering) • Associate Professor of Architectural Engineering • Director, Penn State Center for Sustainability |
| Michael Rios (Department: Landscape Architecture) • Assistant Professor of Landscape Architecture • Director, Hamer Center for Community Design Assistance |
| Robert Rioux (Department: Chemical Engineering) • Assistant Professor of Chemical Engineering • Friedrich G. Helfferich Assistant Professor |
| Gian Rocco (Department: Geography) • Research Assistant |
| Andrew S. Rogowski (Department: Crop and Soil Sciences) • Adjunct Professor of Soil Physics |
| C. Peter Romaine (Department: Plant Pathology) • Professor of Plant Pathology |
| Gregory W. Roth (Department: Crop and Soil Sciences) • Professor of Agronomy |
| C. Alan Rotz (Department: Pasture Systems and Watershed Management Research Unit) • Agricultural Engineer |