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 although the movie is fictionalized. An Einstein-like character appears in Nicolas Roeg's 1985 film "Insignificance". Set in New York in 1953, the film includes a scene in which "The Professor" (played by Michael Emil), the character evidently representing Albert Einstein, discusses Relativity with "The Actress" (Theresa Russell), a Marilyn Monroe-like character. Einstein was portrayed by Walter Matthau in the 1994 romantic comedy "I.Q". In the 2001 film "", he was portrayed as a holographic personality called Dr. Know (voiced by Robin Williams). The 2009 film "The Nutcracker in 3D" includes a character named Uncle Albert who resembles Einstein, speaks with