Stephen is an Arthur F. Thurnau Professor in the Department of Mathematics. He did his undergraduate work at Santa Clara University and received his Ph.D. from the University of Chicago. Before joining the faculty at the University of Michigan, he had appointments at Harvard and the University of Chicago. He is interested in using geometry and analysis to answer certain questions which arise in number theory. He spends nearly every mathematical free moment with his family; but in his spare time, he fixes his house – be sure to ask for amusing stories about this.