Early in their careers, Michel Foucault and Jacques Derrida argued over madness, reason, and history in an exchange that profoundly influenced continental philosophy and critical theory. In this collection, Amy Allen, Geoffrey Bennington, Lynne Huffer, Colin Koopman, Pierre Macherey, Michael Naas, and Judith Revel, among others, trace this exchange in debates over the possibilities of genealogy and deconstruction, immanent and transcendent approaches to philosophy, and the practical and theoretical role of the archive.