Albert Einstein Einstein did not return to Germany. He settled in the United States and became an American citizen in 1940. On the eve of World War II, he endorsed a letter to President Franklin D. Roosevelt alerting him to the potential development of "extremely powerful bombs of a new type" and recommending that the US begin similar research. This eventually led to the Manhattan Project. Einstein supported the Allies, but he generally denounced the idea of using nuclear fission as a weapon. He signed the Russell–Einstein Manifesto with British philosopher Bertrand Russell, which highlighted the danger of nuclear weapons. He was
Albert Einstein Science Park architect Paul Emanuel Spieker on Telegrafenberg Since 1992 the following newly founded institutes have properties situated on the grounds: In the 1990s the historical buildings were extensively restored and numerous new buildings were erected. The Einstein Tower and the observatory of the Great Refractor of Potsdam also host exhibits. Albert Einstein Science Park The Albert Einstein Science Park is located on the hill Telegrafenberg in Potsdam, Germany. The park was named after the physicist Albert Einstein. The best known buildings in the park are the Einstein Tower, an astrophysical observatory that was built to perform checks of Einstein's theory of