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
Evelyn Einstein In 1996 she sued the trustee in charge of a collection of correspondence between Albert and Mileva Einstein, a suit that was settled privately. She left her entire estate valued over a million dollars to attorney Allen P. Wilkinson. Evelyn Einstein Evelyn Einstein (28 March 1941 – 13 April 2011) was the adopted daughter of Hans Albert Einstein, the son of Albert Einstein. Einstein was born in Chicago; after her birth she was adopted by Hans Albert Einstein. Towards the end of her life, she recounted that as a child she was told she was an illegitimate daughter of Albert