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, a member of the Environmental Studies program steering committee, the Humanities program steering committee, the executive committee of the Department of Philosophy, the executive committee of the Department of Modern Languages, and currently holds the positions of Vice Chair of the University Committee, Chair of the Faculty Senate, and Chair of the Chancellor Search and Screen Committee. 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 has been elected in all-faculty elections twice to the University Committee, and to the Faculty Rights and Responsibilities Committee. On the latter, he served as Chair during faculty disciplinary, non-renewal, and grievance hearings. He was a founding member, and for many years Director or Co-director, of the Environmental Studies program. He has served on the University Planning Council, the Academic Achievement Assessment Committee, the Faculty Senate, the executive committee of the Department of Geology, and the Provost/Vice Chancellor Search and Screen Committee.

He is a member of the Board of Directors of the Racine Zoological Society, on which he currently holds the positions of Senior Vice Chair for Technical Development and Vice Chair for Conservation Education. 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.