Mahan received his Ph.D. in limnology from Michigan State University. He has formerly served on the faculty of Western Michigan University and as field representative for the Michigan Chapter of the Nature Conservancy. Currently Mahan is associate director of the Au Sable Institute for Environmental Studies in Mancelona, Michigan. Brand received his Ph.D. in animal ecology from the University of Michigan. He is a retired biology professor and a former chair of the Department of Biology and Division of Science at Wheaton College in Wheaton, Illinois. Presently Brand is a research associate of the Morton Arboretum in Lisle, Illinois. He is also coauthor (with John R. Sheaffer) of Whatever Happened to Eden? (Tyndale). Fred H. Van Dyke received his Ph.D. in environmental and forest biology from the State University of New York/Syracuse. A former wildlife research biologist with the Montana Department of Fish, Wildlife and Parks, Van Dyke is currently professor of biology and director of the Environmental Studies Program at Wheaton College. He is the author of a textbook on conservation biology, Conservation Biology: Foundations, Concepts, Applications. Joseph K. Sheldon received his Ph.D. in entomology from the University of Illinois. He is a former professor and head of the Department of Biology at Eastern University (St. Davids, Pennsylvania) and former professor of biology at Messiah College (Grantham, Pennsylvania). He is now a research volunteer at the Au Sable Institute of Environmental Studies (Coupeville, Washington). Sheldon is the author of Rediscovery of Creation: A Bibliographical Study of the Church's Response to the Environmental Crisis and a co-author of Redeeming Creation: The Biblical Basis for Environmental Stewardship.