He was a proponent of scientific racism prior to World War II.
George Montandon helped to perpetuate the hoax of De Loys's ape and fought for it be scientifically recognised as a new species.
Today, De Loys's ape is virtually unanimously regarded as a hoax.
However, even under Vichy, he and the movement to which he belonged with René Martial remained marginal in the French intellectual world.
He and his wife were killed by the French Resistance for collaborating with the Nazis.