Otto Hahn

Otto Hahn, born on March eighth, eighteen seventy-nine, was a pioneering German chemist and nuclear physicist, often hailed as the father of nuclear chemistry. His groundbreaking work in radiochemistry led to the discovery of nuclear fission, a pivotal advancement that underpins both nuclear reactors and weapons. Alongside his collaborator Lise Meitner, Hahn identified isotopes of several radioactive elements, including radium, thorium, protactinium, and uranium, and made significant contributions to the understanding of atomic recoil and nuclear isomerism.

A graduate of the University of Marburg, Hahn earned his doctorate in nineteen oh one. He furthered his studies under notable scientists such as Sir William Ramsay in London and Ernest Rutherford in Montreal, where he discovered various new radioactive isotopes. Returning to Germany in nineteen oh six, he established a laboratory at the University of Berlin, where he completed his habilitation in early nineteen oh seven and became a Privatdozent. By nineteen twelve, he was appointed head of the Radioactivity Department at the newly founded Kaiser Wilhelm Institute for Chemistry.

During World War I, Hahn served in a Landwehr regiment and a chemical warfare unit, earning the Iron Cross for his bravery. After the war, he continued to lead the KWIC while overseeing his own department. His collaboration with Strassmann and Meitner from nineteen thirty-four to nineteen thirty-eight culminated in the discovery of nuclear fission. Despite his opposition to Nazism and the persecution of Jewish colleagues, including Meitner, he contributed to the German nuclear weapons program during World War II.

Following the war, Hahn was detained by Allied forces and spent time in Farm Hall with other German scientists. He later became the last president of the Kaiser Wilhelm Society for the Advancement of Science in nineteen forty-six and the founding president of the Max Planck Society from nineteen forty-eight to nineteen sixty. In nineteen fifty-nine, he co-founded the Federation of German Scientists, advocating for responsible science and playing a crucial role in the reconstruction of German science in the post-war era.