Niels Bohr was a Danish physicist born in the late 19th century. He was awarded a Nobel Prize in 1922 in recognition of his work on radiation emission and atomic structures.
He received his doctorate from Copenhagen University in 1911. Later, he returned to the University as a professor and founded the University's Institute of Theoretical Physics in 1920. He headed the institute until his death in 1962.
He worked with Werner Heisenberg on principles of quantum mechanics, and he developed the concept of complementarity and the liquid droplet theory. Bohr wrote 115 publications, including "Atomic Theory and the Description of Nature" and "The Unity of Knowledge." He was married to Margrethe Norlund and had six sons.