Dr. Petersen, Ph. D. is a distinguished Professor Emeritus of Soil and Land Resources at the Pennsylvania State University. His research interests have been primarily in the areas of soil characterization, soil interpretations, soil-water relationships, land use, geographic information systems, and remote sensing. He has worked very closely with the Natural Resources Conservation Service in the areas of soil mapping, correlation, characterization, and interpretation. Dr. Petersen is a Fellow of the American Society of Agronomy and the Soil Science Society of America.