A prominent member of the Belgian Laïcité movement, he is the founder and president of the Centre Laïque de l'Audiovisuel.
He made a mark in Argentine politics with his strong opposition to Laïcité, which characterized the Generation of '80 that governed the country in the second half of the 19th century and the beginnings of the 20th.
The leading legal reforms instituted included a secular constitution (laïcité) with the complete separation of government and religious affairs, the replacement of Islamic courts and Islamic canon law with a secular civil code based on the Swiss Civil Code, and a penal code based on that of Italy (1924–37).
Les enjeux de la laïcité, with Alain Bondeelle, Jean Boussinesq, Alain Boyer, Driss El Yazami, Alain Gresh, Michel Morineau, Émile Poulat, Tariq Ramadan, Joël Roman, Michel Tubiana, L'Harmattan, 2005.