He is perhaps best known for his monument to the hostages and Resistance fighters who were shot at Mont Valérien during World War II (1939–45).
[8] Convert contrasts the Mont Valérien of the Gaullist ceremonies, exalting the FFI resistance, and the place where the firing squads executed their victims.
[10] In 2007 Convert published a historical biography of Joseph Epstein ("Colonel Gilles"), a leader of the Franc Tireurs Partisans (FTP) in the Île-de-France who was shot at Mont Valérien in 1944.
During his research he made a fourth crystal sculpture named Le temps scellé and a documentary film Joseph Epstein, bon pour la légende.
In 2008 he received a public commission to make a set of stained glass windows for the Abbey church of Saint-Gildas-des-Bois.
[12] He uses a wide range of techniques, from traditional molding, prints, Japanese lacquer and metalwork to computer modelling, image synthesis and digital animation.
[13] His work has been exhibited at other galleries and public buildings in France and elsewhere in Europe including Madrid, Karlsruhe, Hamburg and Berlin.