Aage Niels Bohr was a Nobel Prize winning nuclear physicist. His father, Niels Bohr, also a Nobel Laureate, was known for his pioneering work on atomic structure and quantum theory. Since he was the only one of his father’s six children who studied physics, he began to help his father in writing articles and letters while he was still a student at the University of Copenhagen. However, his studies were shortly interrupted because the Germans, who had by then invaded Denmark, ordered their arrest. Fortunately, they were able to escape to Norway and from there to England. Here young Bohr was officially appointed as a junior researcher at the Department of Scientific and Industrial Research. However, he served mainly as personal assistant to his father and flew to the USA a number of times to take part in Manhattan Project. After the war he went back to Denmark and completed his studies. Subsequently, he joined the University of Copenhagen as a research fellow and quickly climbed up the ladder to become director of the Niels Bohr Institute. Later he relinquished the post and spent the last years concentrating on research work.