During the German occupation he was dean of the Faculty of Science, and he was able to uphold the dignity of the French university in spite of the arrogance of the occupiers and the servility of their collaborators.
Sa panahon ng German trabaho siya ay dean ng Faculty of Science, at siya ay makapag-sang-ayunan ang karangalan ng French unibersidad kahit na ang pagmamataas ng occupiers at ang pagkabusabos ng kanilang mga tagatulong.