10 May Louis-Victor de Broglie
Dead: 19 March 1987
He was a French physicist who made groundbreaking contributions to quantum theory.
In his 1924 PhD thesis, he postulated the wave nature of electrons and suggested that all matter has wave properties.
This concept is known as the de Broglie hypothesis, an example of wave–particle duality, and forms a central part of the theory of quantum mechanics.
De Broglie won the Nobel Prize for Physics in 1929, after the wave-like behaviour of matter was first experimentally demonstrated in 1927.