In 1951 he became the chief engineer of the Freyssinet Company and moved to the United States where he began constructing single and multiple span bridges.
The technique was further developed using epoxy on the joints along with pre-cast concrete segmental box-girder technology, which was applied in 1962 on the Choisy-le-Roi Bridge extending over the Seine River in Paris, France[2] In 1955 he began working for Campenon Bernard in Paris, France, where he worked with large pre-stressed concrete projects.
[2] He also designed in 1997, one of the greatest engineering project in Canada, known as the Confederation Bridge connecting over the Gulf of St-Lawrence on a distance of 12.9 km the Province of New Brunswick and Prince Edward Island.
Cast-in-place joints meant that the sections were mortared together at the bridge construction site while cranes or structural supports held up the pre-cast segments.
He normally attended the long established (pre 1870s) Assemblée des Freres at 32 Villa Wagram, 233 rue du Faubourg Saint-Honoré, 75008 Paris.