From Wikipedia: Michael Williams (born 6 July 1947) is currently the Kreiger-Eisenhower Professor of Philosophy at Johns Hopkins University and chair of the department. Williams is a noted epistemologist, and has significant interest in the philosophy of language, Wittgenstein, and the history of modern philosophy. He is particularly well-known for his work on philosophical skepticism. He received his BA from the University of Oxford and his PhD. from Princeton University under the direction of Richard Rorty. He has taught at Yale University, the University of Maryland, and Northwestern University. He is married to the philosopher and noted Wittgenstein scholar Meredith Williams, also a member of the Johns Hopkins philosophy faculty.