Leonard Lawlor is Edwin Earle Sparks Professor of Philosophy at Pennsylvania State University. He is one of the leading Derrida scholars in the United States today and has written numerous books that deal, either in whole or in part, with the implications of Derrida's philosophy. Most recently, The Implications of Immanence (Fordham, 2006) and This is Not Sufficient: An Essay on Animality and Human Nature in Derrida (Columbia University Press, 2007).