On the Fourfold Root of the Principle of Sufficient Reason / On Vision and Colours / On Will in Nature

David E. Cartwright is a Professor of Philosophy and Religious Studies and the chair of the Department of Philosophy and Religious Studies at the University of Wisconsin, Whitewater. He has numerous publications in nineteenth-century German philosophy and has edited and translated a number of Schopenhauer's books, most recently, with Edward E. Erdmann, The Two Fundamental Problems of Ethics (2010); and he is the author of Schopenhauer: A Biography (2010).

Edward E. Erdmann is an emeritus faculty member of the University of Wisconsin, Whitewater with a scholarly background in classical and early modern rhetorical theory. He writes regularly on subjects in agriculture, has edited German translations of textbooks and scientific reports on organic agriculture.

Christopher Janaway is Professor of Philosophy at the University of Southampton. He has published widely on nineteenth-century German philosophy, including Self and World in Schopenhauer's Philosophy (1989), The Cambridge Companion to Schopenhauer (1999), Schopenhauer: A Very Short Introduction (2002), and Beyond Selflessness: Reading Nietzsche's Genealogy (2007). He is General Editor of The Cambridge Edition of the Works of Schopenhauer, in which he has translated The Two Fundamental Problems of Ethics and co-translated The World as Will and Representation, Volume 1.