Native french speaking screenwriter needed.

I am in need of French speaking screenwriter. I would prefer a native speaker, but would love to talk to anyone who is fluent in French. The project is a feature length biopic that spans from the late 1920's to the early 1950's. Authenticity is of the utmost importance. This is why I am not writing the screenplay myself. The dialogue should come from a French perspective, and not simply an English script translated into French.