The current crisis has laid bare the contradictory and shaky character of contemporary capitalism. Yet the essentially inchoate responses to the crisis have dramatically revealed the absence of a robust conceptualization of post-capitalist society and, by implication, of a robust critique of capital. One result has been the continued hegemony of neoliberal discourses and policies. Moishe Postone seeks to fundamentally rethink the core categories of Marx’s critique of political economy in the fall 2015 Ellen Maria Gorrissen lecture. He argues that Marx’s mature critique of political economy, as elaborated in the Grundrisse and Kapital, provides the basis for a different critical theory of modernity with contemporary significance.