Robert F. Diffendal, Jr. graduated with an A.B. degree in geology from Franklin and Marshall (F&M) College in Lancaster, Pennsylvania. He received his M.S. and Ph.D. degrees with majors in geology and emphases on paleontology from UNL. After graduate work Diffendal taught geology, geography, and biology courses at St. Dominic College in St. Charles, Illinois, Doane College (now Doane University) in Crete, Nebraska. He joined the faculty of UNL in 1980 as a member of the Conservation and Survey Division (CSD), where he worked as a research geologist with the rank of professor until his retirement in 2003. He now is a professor emeritus at UNL and a volunteer Curator of Invertebrate Paleontology at the University of Nebraska State Museum. Diffendal has produced articles, guidebooks, maps and other works on the geology of Nebraska and several articles on the geomorphic development of Yellow Mountain in China. He is a Nebraska Licensed Professional Geologist #G-0002.