Erica G. Klarreich is an assistant professor of mathematics at the University of Michigan. She received her bachelor’s degree from Brooklyn College in 1992 and her Ph.D. in mathematics from the State University of New York at Stony Brook in 1997. Her research interests include hyperbolic geometry, Kleinian groups and Teichmüller theory. Address: Department of Mathematics, University of Michigan, Ann Arbor, MI 48109. Internet: klarreic@umich.edu.