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 Larry Roberts is currently teaching parasitology and marine biology at the University of Miami. He received his Ph.D. in Parasitology from Johns Hopkins University and is a coauthor of Foundations of Parasitology, 5/e. Past teaching affiliations include University of Massachusetts, Texas Tech University, and Florida International University. Dr. Roberts has authored numerous research articles and a title of related interest: Underwater World of Sport Diving. Susan Keen is Lecturer at the Section of Evolution and Ecology of University of California. 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. David J. Eisenhour an Associate Professor of Biology at Morehead State University.