Joseph FourierJoseph Fourier, lithograph by Jules Boilly, 1823; in the Academy of Sciences, Paris.
Joseph, Baron Fourier, (born March 21, 1768, Auxerre, Franceādied May 16, 1830, Paris), French mathematician and Egyptologist. While an engineer on Napoleonās Egyptian expedition, he conducted (1798ā1801) anthropological investigations and wrote the preface to the monumental Description de lāĆgypte, whose publication he oversaw (1809ā28). In 1808 he was created a baron by Napoleon. In mathematics he is primarily known for his work in heat conduction (1807ā22), for his use of the Fourier series to solve differential equations, and for the related concept of the Fourier transform. As a scientist and humanist, he epitomized the spirit of French intellectualism of the Revolutionary era.
