George Gamow (Russian pronunciation: [ˈɡaməf:]; March 4 [O.S. February 20:] 1904 – August 19, 1968), born Georgiy Antonovich Gamov (Георгий Антонович Гамов), was a theoretical physicist and cosmologist born in the Russian Empire. He discovered alpha decay via quantum tunneling and worked on radioactive decay of the atomic nucleus, star formation, stellar nucleosynthesis, big bang nucleosynthesis, cosmic microwave background, nucleocosmogenesis and genetics.