On his return to France Laloux rose quickly through the academic system, serving on many juries, societies and foundations.
As practitioner, he produced major commissions in a highly ornamented neo-classical surface style, collaborating with sculptors and muralists squarely in the Beaux-Arts tradition, but doing so on innovative cast-iron frames.
Metal framing allowed higher interior spaces, more generous fenestration, and glass roofs, notably in the sunlit barrel-vault of the Gare d'Orsay.
[3] Laloux had the distinction of training the greatest number of American students at the Ecole, with Jean-Louis Pascal in second place.
[5] At Laloux's death in 1937, his student and partner Charles Lemaresquier succeeded him as head of the studio.