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George Gamow 

George Gamow was born on 4 March 1904 in Odessa, Russian Empire (now Ukraine). He is half Russian and Ukrainian since his parents were Russian-Ukrainian. His mother worked as a teacher and taught history and geography at an all-girls school in Odessa while his father taught literature and the Russian language in a local high school. George Gamow was a developer of Lemaitre's Big Bang Theory.

According to Wikipedia George Gamow led the development of the hot "big bang" theory of the expanding universe. He was the earliest to employ Alexander Friedmann's and Georges Lemaître's non-static solutions of Einstein's gravitational equations describing a universe of uniform matter density and constant spatial curvature. Gamow's crucial advance would provide a physical reification of Lemaitre's idea of a unique primordial quantum. Gamow did this by assuming that the early universe was dominated by radiation rather than by matter.Most of the later work in cosmology is founded in Gamow's theory. He applied his model to the question of the creation of the chemical elements and to the subsequent condensation of matter into galaxies,whose mass and diameter he was able to calculate in terms of the fundamental physical parameters, such as the speed of light c, Newton's gravitational constant G, Sommerfeld's fine-structure constant α, and Planck's constant h.
Gamow's interest in cosmology arose from his earlier interest in energy generation and element production and transformation in stars. This work, in turn, evolved from his fundamental discovery of quantum tunneling as the mechanism of nuclear alpha decay, and his application of this theory to the inverse process to calculate rates of thermonuclear reaction.
In George Gamow's middle and late career, he focused more on teaching and wrote popular books on science, including One Two Three, Infinity and the Mr. Tompkins... series of book in 1939 to 1967. Some of his books are still in print, more than a half-century after their original publication.