Yes, Fourier had a doctorate in mathematics. In 1794, he received his doctorate in mathematics from the École Normale Supérieure in Paris. Fourier was one of the most influential mathematicians of the 18th century. He is best known for his work on the Fourier transform, which is a mathematical tool that can be used to analyze waves and other periodic phenomena.
Unraveling the Mathematics and Physics of Joseph Fourier: A Quiz Exploring His Revolutionary Contributions