May 9, 1931 - Polish-born American physicist Albert Abraham Michelson dies. Michelson was the first American physicist to win a Nobel Prize in the sciences, with his 1907 Nobel Prize in Physics. He is best known for his work in the famed Michelson-Morley experiment, which helped to disprove the concept of ether and, thus, laid the foundation for wave particle duality.
How does "disproving" ether "laid the foundation" for wave-particle duality? It was Einstein's photoelectric effect, which was a completely separate phenomena (and 1905 paper), that "laid the foundation" for such "wave-particle duality". The MM experiment simply shows that the speed of light is isotropic in all directions. There is not even a hint of the "particle" behavior in here.
 I am not fond of this phrase, because it perpetuates the misconception that modern physics, especially quantum mechanics, has two different ways of describing light, which isn't true. While we do use "wave" and "particle" mechanics in different circumstances, this isn't due to a "duality" but rather due to convenience. One can get all those wave-like properties such as diffraction and interference using the SAME QM formulation that make use of the photon picture.