About Carl Friedrich von Weizsäcker
Carl Friedrich Freiherr von Weizsäcker (German: [kaʁl ˈfʁiːdʁɪç fɔn ˈvaɪtsɛkɐ]; 28 June 1912 – 28 April 2007) was a German physicist and philosopher. He was the longest-living member of the team which performed nuclear research in Nazi Germany during the Second World War, under Werner Heisenberg's leadership. There is ongoing debate as to whether or not he and the other members of the team actively and willingly pursued the development of a nuclear bomb for Germany during this time. A member of the prominent Weizsäcker family, he was son of the diplomat Ernst von Weizsäcker, elder brother of the former German President Richard von Weizsäcker, father of the physicist and environmental researcher Ernst Ulrich von Weizsäcker and father-in-law of the former General Secretary of the World Council of Churches Konrad Raiser. Weizsäcker made important theoretical discoveries regarding energy production in stars from nuclear fusion processes. He also did influential theoretical work on planetary formation in the early Solar System. In his late career, he focused more on philosophical, ethical and historical issues, and was awarded several international honours for his work in those areas. What von Weizsäcker foresaw in 1941 was Germany's emergence as the world's first nuclear power. As such, the four-year-old Carl Friedrich Weizsäcker became Baron Carl Friedrich von Weizsäcker.
Biography source: Wikipedia. The profile adds birthday-specific historical context from the Celebs Birthday Today editorial database.