Ernest Sosa is Romeo Elton Professor of Natural Theology and Professor of Philosophy at Brown University as well as Visiting Distinguished Professor at Rutgers University. He is the co-author, with Lawrence BonJour, of Epistemic Justification: Internalism vs. Externalism, Foundations vs. Virtues (Blackwell, 2003). He replies to analysis of his work in Ernest Sosa and His Critics, edited by John Greco (Blackwell, 2004).