J. L. (Joseph Louis) Lagrange

Born in Turin on January 25, 1736, Joseph-Louis Lagrange became one of the great mathematicians of the 18th century. Though born in the Kingdom of Sardinia to a French family, he built an international career, working first in Turin, then in Berlin, and later in Paris.

Lagrange made lasting contributions across mathematics and physics. He is especially known for transforming mechanics into a powerful analytical system in Mécanique analytique, and for major work in number theory, calculus of variations, differential equations, and celestial mechanics. His name remains attached to many core ideas in science, including Lagrange points and Lagrangian methods.

He spent his later years in France, where his reputation was firmly established among Europe’s leading scientists. Lagrange died in Paris on April 10, 1813, leaving behind work that still shapes how mathematicians and physicists describe motion, change, and the structure of the universe.