Jean Baptiste Perrin was a French physicist who, in his studies of the Brownian motion of minute particles suspended in liquids, verified Albert Einstein's explanation of this phenomenon and thereby confirmed the atomic nature of matter. For this work, he was awarded the Nobel Prize in Physics in 1926. The Nobel Prize in Physics 1926, announced November 11, 1926. Jean Baptiste Perrin, “for his work on the discontinuous structure of matter, and especially for his discovery of sedimentation equilibrium”. Jean Baptiste Perrin: born 1870, Lille, France. Wiki link Data: the Nobel Foundation (CC0).