Georges Lema%C3%AEtre

Georges Henri Joseph douard Lematre July 1894 June 1966 was a Belgian priest, astronomer and professor of physics at the Catholic University of Leuven. He proposed the theory of the expansion of the universe, widely misattributed to Edwin Hubble. He was the first to derive what is now known as Hubbles law and made the first estimation of what is now called the Hubble constant, which he published in 1927, two years before Hubbles article. Lematre also proposed what became known as the Big Bang theory of the origin of the Universe, which he called his hypothesis of the primeval atom or the Cosmic Egg.

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Source: Wikipedia