French philosopher who began as the youngest of Louis Althusser's students at the École normale supérieure and became, over six decades, one of the most careful living theorists of citizenship, borders, race, and the European political settlement. With Louis Althusser, Rancière, Macherey, and Establet he co-authored Reading Capital (1965) — the volume that made structural Marxism a discipline — contributing the essays on the "basic concepts of historical materialism." Unlike most of that cohort he did not break polemically with his teacher; his working life has been one of patient extension, correction, and reopening of the Althusserian project, even after leaving the French Communist Party in 1981 over its handling of immigration.
From the late 1980s his work turned outward to the political questions that the Marxism of his youth had treated as derivative: the relation between nation and class, citizenship as a site of inclusion and exclusion, the afterlives of colonialism in European political identity. Race, Nation, Class: Ambiguous Identities (1988), co-authored with world-systems sociologist Immanuel wallerstein-immanuel, argued that racism is not a leftover of pre-modern prejudice but a structural feature of modern nation-state capitalism, continually reproduced at the point where class lines and border lines intersect. We, the People of Europe? (2001) and the essays in Equaliberty (2010) develop his signature concept égaliberté — equal-liberty — the claim that equality and liberty are not balancing rivals, as liberal theory treats them, but mutually constitutive: no freedom without equality of those who claim it, and no equality without the freedom to act on it.
Balibar is the least showy of the heirs of French theory. He writes in long sentences, quotes Spinoza and Kant with equal care, and takes seriously both the strategic questions that post-structuralism often evaded (what is a border? what is a citizen?) and the philosophical ones that strategic Marxism dismissed. The result is a body of work that is read by political theorists, migration scholars, and legal theorists as often as by philosophers — a quieter but perhaps more durable inheritance of the Althusserian moment than the more famous departures of Jacques Rancière or Alain Badiou.