He then earned a degree in demography at the University of Paris 1 Pantheon-Sorbonne,[2] as well as a doctorate in sociology at the School for Advanced Studies in the Social Sciences.
As a member of the union, he attended conferences put on by the likes of Alain Touraine, Pierre Bourdieu, Raymond Aron, Georges Gurvitch, and Jacques Berque.
Rouissi returned to Tunisia in 1966 and joined the Centre d'études et de recherches économiques et sociales, where he wrote numerous articles and collective works and contributed to scientific studies.
He wrote essays such as Une oasis du Sud tunisien, le Jarid, Essai d'histoire sociale and Population et société au Maghreb.
Alongside Salah Baccari, Rouissi wrote President Ben Ali's final speech, given on 13 January 2011 just before the end of the Tunisian Revolution.