Gérard Desargues (February 21 or March 2, 1591-October 1661) was a Frenchmathematician and engineer, who is considered one of the founders of projective geometry. He is the eponym of Desargues' theorem and of the crater Desargues on the Moon.Born in Lyon, Desargues came from a family devoted to service to the French crown. His father was a royal notary, an investigating commissioner of the Seneschal's court in Lyon (1574), the collector of the tithes on ecclesiastical revenues for the city of Lyon (1583) and for the diocese of Lyon.Gérard Desargues worked as an architect from 1645. Prior to that, he had worked as a tutor and may have served as an engineer and technical consultant in the entourage of Richelieu.
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