Neils Bohr was born on October 7, 1885, and died on November 18, 1962. He worked under Sir J.J. Thomson in the Cavendish Laboratory in 1911. However, at the same time he was also developing his own theories. In 1912, he worked for Professor Rutherford.
He came up with the planetary model of the atom, also called the Bohr Model. In this model, he shows that electrons travel in specified energy levels. He also determined that spectrum lines are produced when electrons move.