I. Dr. Niels Bohr was a very important man and scientist for many reasons. I will cite several here, but many more works and accomplishments will not be listed here. Dr. Bohr was known one of the foremost scientists of the 20th century; Bohr was the first to apply the quantum theory to the problem of atomic and molecular structure. He was a guiding spirit and major contributor to the development of quantum physics. He is responsible for the Correspondence Principle, one of the most important concepts for the understanding of the relation between quantum events and experience in the "macro-world". He studied the structure of the atom early in his career around 1919, which will reap great benefits for the United States many years later. Dr. Bohr Bohr's subsequent studies, however, became more and more theoretical in character. He wrote award winning papers on radioactive phenomena and alpha rays.
Recognition of his work on the structure of atoms came with the award of the Nobel Prize for 1922 in physics. Bohr also contributed to the clarification of the problems encountered in quantum physics, in particular by developing the concept of complementarily.
Among Professor Bohr's numerous writings (some 115 publications), three appearing as books in the English language are highly thought of and used today.
During the WWII is when I know Prof Bohr made his best contributions and influence to the United States. After escaping from Nazi Held territory. He made it to the United States, where he debriefed high ranking government officials to the knowledge that Germany was working on splitting the atom. This quickly sent the USA into a rage to create the atomic bomb first. The implication that the Nazis could develop extremely powerful weapons prompted President Roosevelt to establish the Manhattan Project. This was...