Gregory C. Mayer (B.S., State University of New York at Stony Brook, 1979; A.M., Harvard University, 1981; Ph.D. Harvard University, 1989) is Associate Professor in the Department of Biological Sciences, and a member of the Environmental Studies and Liberal Studies steering committees.  He came to the University of Wisconsin–Parkside in 1992, after holding post-doctoral research fellowships at the Smithsonian Institution in Washington, D.C., and at the University of Wisconsin, Madison, where he was also Lecturer in Zoology.

He teaches courses in ecology, evolution, zoology, statistics, and history of science, primarily for Biological Sciences majors, and also teaches a course on "Science and Pseudoscience", which is one of the most popular General Education courses at the University. He has frequently taught field courses in Costa Rica and Nicaragua. His research interests are in the ecology, evolution, and biogeography of vertebrates, especially the amphibians and reptiles of the West Indies.

He is an Associate Editor of Evolution, the Coordinator of the Red List Authority for Anoline Lizards for the Anoline Lizards Specialist Group of the Species Survival Commission of the International Union for the Conservation of Nature, Adjunct Curator of Reptiles and Amphibians at the University of Wisconsin Zoological Museum, Madison, and a Field Associate in the Department of Zoology at the Field Museum of Natural History, Chicago.

He chaired the Chancellor Search Committee that led to the inauguration in 2009 of Dr. Deborah L. Ford as the University's sixth Chancellor. He has been elected in all-faculty elections twice to the University Committee, serving as Vice Chair and Chair of the Faculty Senate, and to the Faculty Rights and Responsibilities Committee. He was a founding member, and for many years Director or Co-director, of the Environmental Studies program, and has served as the Chair of the Department of Philosophy and as a member of the executive committee of the Department of Geology. He has served on the the Faculty Senate, the Faculty Senate Budget Committee, the University Planning Council, the Academic Achievement Assessment Committee, the Health, Safety and Physical Environment Committee, the Provost/Vice Chancellor Search and Screen Committee, and numerous other University committees.

He is Past Chairman of the Board of Directors of the Racine Zoological Society. He frequently gives programs on zoological and environmental subjects to schools and community groups in Racine and Kenosha. He is also the organizer of the adult soccer program at the Soccer Complex of Racine in Franksville, which currently has over 100 active members from Racine, Kenosha, and nearby communities, and has been a volunteer in numerous local, state, and national political campaigns.