Answer
d'Alembert was a key figure in the French Enlightenment. He was a polymath who made significant contributions to mathematics, physics, philosophy, and literature. He was also a prolific writer and editor, and he played a leading role in the Encyclopédie. d'Alembert's work helped to spread the ideas of the Enlightenment to a wider audience, and he helped to shape the intellectual landscape of the 18th century.