Michael Plummer is a professor of biology at Harding University. He has published seventy-four articles and holds adjunct appointments at Louisiana State University at Shreveport, University of Memphis, Southeast Louisiana University, and Southwest Missouri State University. At Harding, Plummer has held positions as the Coons Endowed Chair of Biomedical Sciences (1990-1995) and as the chairman of the Department of Biology (1986-1991).
Henry W. Robison is coauthor of Amphibians and Reptiles of Arkansas, Fishes of Arkansas, and Only in Arkansas: A Study of the Endemic Plants and Animals of the State. He is Professor of Biology at Southern Arkansas University, Magnolia, Arkansas.