Geoffroy Du Crotay is not to be found among the members of the University of Paris. He is first to be met at the reinstatement of a prisoner taken from the prisons of the cathedral of Rouen. He is cited as lawyer pensionné of the Chapter in 1435, and he was still living in 1462.

Geoffroy du Crotay and his colleague, Le Doulx, gave it as their opinion in the session of March 27, 1431, that Jeanne ought to have at least three days' delay before being excommunicated, but when they deliberated with the other lawyers of the court on her assertions, they fell back upon the judgment of the Parisian theologians.