He attended the Lycée Pasteur and then the Lycée Louis-le-Grand before entering the École Normale Supérieure in 1975. Lions studied at the École Normale Supérieure from 1975 to 1979.
Siya ang nag-aral sa Lycée Pasteur at pagkatapos ay ang Lycée Louis-le-Grand bago ang pagpasok sa École Normale Supérieure sa 1975. Lions-aral sa École Normale Supérieure 1975-1979.