Paul E. Turner is an assistant professor of ecology and evolutionary biology@Yale University. He received his Ph.D. from Michigan State University in 1995. He is interested in the ecology and evolution of infectious diseases and the use of laboratory populations of microbes as models to address these topics. Address: Department of Ecology and Evolutionary Biology, Yale University, P. O. Box 208106, New Haven, CT 06520. Internet: paul.turner@yale.edu