Niels Bohr was born on October 7, 1885 in Copenhagen, Denmark. His father was Christian Bohr, a prominent physiologist and a professor at Copenhagen University. His mother was Ellen Adler Bohr, the daughter of a wealthy Jewish banker. As Bohr grew up, he was surrounded with his fathers work. This ignited his interest in physics from a young age. Bohr enrolled in Copenhagen University in 1903 to study physics. He received his masters in 1909 and then a doctors degree in 1911. He left Copenhagen to study under JJ Thomson and later went to Manchester with physicist Ernest Rutherford.
Furthermore, Niels Bohr expanded upon Rutherford's atomic nucleus concept. Theorizing three things, that electrons' position at a fixed distance from the nucleus, around which they orbit. Chemical properties where determined by the number of electrons in the outer orbit and third, electrons can jump from a higher to a lower orbit emitting a photon of discrete energy. The Niels Bohr model of the atomic structure became the basis for all future quantum theories. It remains a quintessential part of the modern day understanding of the atomic structure. His work later earned him a Nobel prize in 1922.
In 1960, Bohr returned to Copenhagen to work as a professor at the University of Copenhagen. Four years later he was appointed head director of the new institution on theoretical physics. Bohr had established himself as a firm physicist, yet he still received criticism especially from German physicist, Albert Einstein. Einstein was a huge critic of the quantum theory. He often challenged many of Bohr's findings. Their debates helped refine a century long understanding of quantum physics.
During World War II, Bohr sheltered many fleeing Jewish physicist at his institute in Denmark. However, his Jewish ancestry and anti-Nazi sentiment placed him in great danger with the threat of Nazi invasion. In order to evade German arrest, Bohr and his family fled to the