John D. Harder is associate professor emeritus in evolution, ecology, and organismal biology at The Ohio State University, where he taught upper-division courses in mammalogy and conservation biology. His research on the reproductive biology and ecology of mammals has focused on marsupials and involved field studies in Ohio, Venezuela, and Amazonian Peru.

Guy N. Cameron is professor emeritus and former head of biological sciences at the University of Cincinnati, where he taught courses in ecology, population biology, and ecological techniques. He is the former president of the American Society of Mammalogists and the Texas Mammal Society. His research focuses on rodents in the US and Mexico, but he also studies invasive plants, the impact of tornados on forests, and nutritional ecology.