He teaches political philosophy at the École des Hautes Études en Sciences Sociales, in the Centre de recherches politiques Raymond Aron.

], he is also a visiting teacher in Boston College at the Department of Political Science.

After graduating from the École normale supérieure, he became assistant to Raymond Aron at the Collège de France.

He was one of the founders of the quarterly Commentaire and remains a regular contributor.

A eurosceptic[1] and a classical liberal, he has been called by The Weekly Standard "the most profound of the Euroskeptical philosophers".