He joined the Agence France-Presse, and in 1955 Le Monde, for which he covered the Iranian Revolution.
Egyptian President Gamal Abdel Nasser gave him an interview in 1963 in which he announced the gradual release of communist prisoners.
[4] French President François Mitterrand charged him in 1984 with an informal diplomatic mission to Libyan President Muammar Gaddafi to negotiate the withdrawal of Libyan troops installed in Chad.
Just before the 1986 legislative elections, he was sent on a confidential mission to Tehran to negotiate – without success – the release of French hostages in Lebanon.
[6] Rouleau also served as French ambassador to Turkey from 1988 to 1991 and as a member of the sponsorship committee of the Russell Tribunal on Palestine.