De Casteljau and Bézier were both French mathematicians paid by different French car companies to work on systems for doing computer-aided design for cars, beca

De Casteljau and Bézier were both French mathematicians paid by different French car companies to work on systems for doing computer-aided design for cars, because of advantages vs. building physical scale models. Bernstein was a Jewish Ukrainian mathematician who studied in Germany and later worked in Moscow, and his main research was about partial differential equations, probability, and function approximation, three "applied" topics. (Of course all of these topics also have theoretical aspects; such is the nature of mathematics.)