This chapter establishes the book’s main argument by proposing to reread claims for the artistic, philosophical, and political significance of Art & Language’s work through the geographical scope of the collective’s work, which is where its interest in concepts is most evident. Bringing together tendencies in the literature on conceptual art and conceptualism that respectively parse its conceptuality and expand its geography, the introduction positions the conceptually rigorous work of Art & Language at the core of the conceptual art movement’s historical significance for twentieth-century art. Specifically, it shows how a stronger theory of the conceptual in art, one attainable via an examination of the internationality of Art & Language’s work, can help to ground claims for conceptual art’s historical significance, especially those to do with the politics of art that issues from attentiveness to concepts.