Michael Williams is the author of  numerous and groundbreaking publications on skepticism. He is  Professor of Philosophy at Johns Hopkins.

Michael Williams is a Krieger-Eisenhower Professor of Philosophy. Before coming to Johns Hopkins, he taught at Yale, the University of Maryland, and Northwestern. He has been the recipient of an NEH fellowship and has held visiting positions at several universities including Chicago, Michigan, Pennsylvania, and MIT. His main areas of interest are epistemology (with special reference to skepticism), philosophy of language and the history of modern philosophy. In addition to numerous articles, he is the author of Groundless Belief (1977; 2nd edition 1999), Unnatural Doubts (1992; 2nd edition 1996) and Problems of Knowledge (2001). He is currently working on Curious Researches: Reflections on Skepticism Ancient and Modern (From http://philosophy.jhu.edu/directory/michael-williams/)