This major voice in French philosophy presents a classic study of how particular political and cultural ideas come to dominate society. Spanning the years 1964 to 1973, On Ideology contains the seminal text, “Ideology and Ideological State Apparatus” (1970), which revolutionized the concept of subject formation. In “Reply to John Lewis” (1972–73), Althusser addressed the criticisms of the English Marxist toward On Marx and Reading Capital. Also included are “Freud and Lacan” (1964) and “A Letter on Art in Reply to André Daspre” (1966).