Penelope Maddy received her BA in Mathematics from UC Berkeley and her PhD from Princeton. Since then, she has held positions at the University of Notre Dame, the University of Illinois at Chicago, and since 1987 at the University of California at Irvine. Since 1998, her appointment has been in Irvine's Department of Logic and Philosophy of Science, of which she was the founding chair. She is the author of Realism in Mathematics, Naturalism in Mathematics (Lakatos Award 2002), Second Philosophy, Defending the Axioms, and The Logical Must.