Erich Fromm was one of the central and best-known members of Twentieth-Century Marxist Humanist Tradition. His book, Marx’s Concept of Man contained one of the first English-language translations of the majority of Marx’s 1844 Manuscripts, as well as sections from other works, such as The German Ideology and The Critique of Political Economy. Marx’s Concept of Man appeared some six years after The Sane Society, a book in which Fromm expounded aspects of Marx’s thought relative to successful developments in late-stage capitalism. In both books, Fromm’s engagement has been dismissed as shallow and inconsistent. In this chapter, I will make the case that this view misconstrues the nature of Fromm’s engagement with Marx, which did not consist of merely repeating what Marx said but, rather, of a critical grappling through which he sought to extend key elements of his account of social being relative to the dominance of capital.