Gregg F. Gunnell is an Associate Research Scientist and Vertebrate Collection Coordinator at the Museum of Paleontology, University of Michigan. He has spent the last 32 years studying the origin and diversification of modern mammals, mostly focusing on the fossil record and what it can tell us about these groups of organisms.
Nancy B. Simmons is Curator-in-Charge of the Department of Mammalogy, American Museum of Natural History, New York. Her research focuses on the systematics and evolution of bats, including projects that range from higher-level phylogenetic studies to descriptions of new species. In 2008 she was awarded the Gerrit S. Miller Award from the North American Society for Bat Research.