He designed or co-designed six contributing properties in the Hollywood Boulevard Commercial and Entertainment District,[3] won a Best Art Direction Oscar for The Adventures of Robin Hood,[4] and was nominated in the same category for Mission to Moscow.

His father, Karl Friedrich Weyl, was an architect and field engineer of the Gotthard Rail Tunnel through the Alps.

Carl Jules Weyl studied at the École des Beaux-Arts in Paris after architectural training in Berlin, Strasbourg, and Munich.

[6] He served as a first lieutenant of infantry in the German Reichswehr, according to his World War I draft registration card.

Weyl worked as an architect in California, first for John W. Reid Jr. in San Francisco, then in Los Angeles after he moved there in 1923.