Freiherr von Gottfried Wilhelm Leibniz

Born in Leipzig in 1646, Leibniz was educated in law but quickly proved to be one of Europe's great polymaths. He worked as a diplomat, political adviser, librarian, historian, and inventor, building a career that moved easily between court politics and scholarship.

His influence on mathematics was enormous. Independently of Isaac Newton, he developed calculus, and the notation he introduced—including the integral sign and forms of differential notation—became standard. He also worked on binary arithmetic, mechanical calculating devices, and early ideas in logic that later thinkers would see as strikingly modern.

In philosophy, Leibniz is famous for his theory of monads, his efforts to reconcile science and religion, and his confidence that reason could uncover deep order in the world. Writing in Latin, French, and German, he left behind a vast body of letters and manuscripts that show a mind constantly at work across many fields at once.