Jacob Klein is Associate Professor of Philosophy at Colgate University. He has been a Fulbright research fellow at the Humboldt University in Berlin and a Visiting Nelson Endowed Professor at the University of Michigan. Nathan Powers is Associate Professor of Philosophy at the State University of New York (SUNY) at Albany. He has held a Whiting Foundation Honorific Fellowship in the Humanities and a Senior Research Fellowship at the Humboldt University in Berlin.