	Tassez was born in Dornecy. He became a journalist for the La Marseillaise, and was later appointed president of the SOFIRAD and director of the RMC. He ran a company specializing in communication and influences: the Astorg Council. He was one of the few forces starting the Mitterrand–Pasqua affair, by filing a complaint against Yves Bertrand. He was a companion of the famous actress Charlotte Rampling. He died on 2 October 2015 in the Hôpital Européen Georges-Pompidou in Paris.