He then taught economics at Sciences Po (1958-59), where he was one of the first scholars at the Centre de Recherches et d'etudes Internationales (CERI) in 1958.

He advised the presidential election campaigns of Valéry Giscard d'Estaing in 1981, Raymond Barre in 1988, and François Bayrou in 2002.

In particular, he has been a member of the French Economic and Social Council from 1994 to 2004 and of the Conseil d'analyse de la société [fr] from 2004 to 2008.

[citation needed] In 1978 Casanova cofounded Commentaire with Raymond Aron, and since then has been its director, a position that covers the roles of both publisher and editor.

A frequent commentator on France Culture public radio, he was the co-host of its program La Rumeur du monde together with Jean-Marie Colombani.