John G. Vandenbergh is a professor of zoology at North Carolina State University. He received his Ph.D. in 1962 from Penn State. His current research focuses on the effects of prenatal hormone exposure and endocrine disruption on variations in rodent anatomy, physiology and behavior. He has advised the EPA on issues relating to environmental endocrine disruptors. Address: Department of Zoology, N.C. State University, Raleigh, NC 27695-7617. Internet: vandenbergh@ncsu.edu