He then began his first research work under the direction of Michel Vovelle, who was the successor two years previously to Albert Soboul.
In 1998, following the publication of this thesis, he obtained the grand history prize of the General Council of Bouches-du-Rhône, awarded by a jury chaired by historians Maurice Agulhon and Robert-Henri Bautier.
He was a lecturer in modern history at the University of Reims Champagne-Ardenne from 1995 to 1998, before being appointed to Paris I at the start of the 1999 academic year.
[7][8][9] In 2015, he signed a text published in Le Monde which protested against "lies and fantasies" relayed in opinion by the media about the new history programs in college.
[10] In 2017, he co-signed a platform in Mediapart entitled "Faire gagner la gauche passe par le vote Mélenchon".