Einstein was mentioned in the link as having published a paper on Brownian motion in 1905. For more context, 1905 is known as his "annus mirabilis" (miracle year), when he published (four groundbreaking) papers on three different topics: the photoelectric effect, Brownian motion, and special relativity. His Nobel prize in physics only cited the photoelectric effect, which to be fair was important for quantum physics. But Brownian motion, where he argued that there are ATOMS, and the special theory of relativity, which revolutionized our understanding of space and time (and he's most famous for, E=mc^2), were swept under the rug of "his services to Theoretical Physics".