Cleve Hickman is Professor Emeritus at Washington and Lee University, Lexington, VA. He received his Ph.D. in Zoology from the University of British Columbia, did research in animal physiology for eight years, and taught zoology for over 30 years. He's made over 20 trips to the Galapagos Islands for research and as an instructor for student field trips Allan Larson is an Associate Professor at Washington University, St. Louis, MO. He received his Ph.D. in Genetics at the University of California, Berkeley. His fields of specialization include Evolutionary Biology, Molecular Population Genetics and Systematics, and Amphibian Systematics. He's taught courses in general biology, evolution, and population biology.