Jonathan Dancy is Professor of Philosophy at the University of Reading and the University of Texas at Austin. He is the author of Introduction to Contemporary Epistemology (Blackwell, 1985), Berkeley (1987), Moral Reasons (Blackwell, 1992) and Ethics without Principles (2004). Ernest Sosa is Board of Governors Professor at Rutgers University. He is the author of Epistemic Justification: Internalism vs. Externalism, Foundations vs. Virtues (together with Laurence BonJour) in the Wiley-Blackwell series Great Debates in Philosophy (2003), A Virtue Epistemology; Apt Belief and Reflective Knowledge, Volume I (2007), and Reflective Knowledge; Apt Belief and Reflective Knowledge, Volume II (2009). His publications also include his replies for the volume Sosa and His Critics (edited by John Greco, 2004) in the Wiley-Blackwell series Philosophers and Their Critics, as well as numerous articles. Matthias Steup is Professor of Philosophy at Purdue University. He is the author of An Introduction to Contemporary Epistemology (1996) and many articles in epistemology. He edited Knowledge, Truth, and Duty: Essays on Epistemic Justification, Responsibility, and Virtue (2001), and he is co-editor with Ernest Sosa of Contemporary Debates in Epistemology (Blackwell, 2005).