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 in popular culture a German accent, and recites Albert Einstein quotes, but is never explicitly identified as Einstein. The "Star Wars" character Yoda's eyes were modeled after Einstein's. In the movie "Back to the Future", the character of Dr. Emmett 'Doc' Brown, played by actor Christopher Lloyd and portrayed as a brilliant scientist, time traveler and inventor, has a dog called "Einstein", named after Brown's favorite scientist, as well as bearing a superficial resemblance to him. Lloyd also credited Einstein as being his inspiration for the character. In the 2011 film, "", the Autobot character known as Que sports an Einstein-inspired head design,