He worked at the Kaiser Wilhelm Institute for Physics (KWIP) and contributed to the German nuclear energy project, also known as the Uranium Club.
[1] During World War II, Fischer worked in the German nuclear energy project, also known as the Uranverein (Uranium Club).
[1] In the latter years of World War II, Berlin scientific organizations moved equipment and personnel out of the city to escape effects of Allied air raids.
Fischer, and to a lesser extent Bopp, were found by blood tests to have suffered damage from neutron radiation exposure.
From 1956, he was employed at the newly founded German firm GKSS, where he conducted research for the construction of nuclear reactors.