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Although initially treated with skepticism from many in the scientific
community, Einstein's works gradually came to be recognised as significant
advancements. He was invited to teach theoretical physics at the University
of Bern in 1908 and the following year moved to the University of Zurich,
then in 1911 to Charles University in Prague before returning to ETH (the
newly renamed Federal Polytechnic School) in Zürich in 1912. In 1914, he
was elected to the Prussian Academy of Sciences in Berlin, where he
remained for 19 years. Soon after publishing his work on special
relativity, Einstein began working to extend the theory to gravitational
fields; he then published a paper on general relativity in 1916,
introducing his theory of gravitation. He continued to deal with problems
of statistical mechanics and quantum theory, which led to his explanations
of particle theory and the motion of molecules. He also investigated the
thermal properties of light and the quantum theory of radiation, the basis
of the laser, which laid the foundation of the photon theory of light. In
1917, he applied the general theory of relativity to model the structure of
the universe.[11][12]
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In 1933, while Einstein was visiting the United States, Adolf Hitler came
to power. Because of his Jewish background, Einstein did not return to
Germany.[13] He settled in the United States and became an American
citizen in 1940.[14] On the eve of World War II, he endorsed a letter to
President Franklin D. Roosevelt alerting him to the potential German
nuclear weapons program and recommending that the US begin similar
research. Einstein supported the Allies, but generally denounced the idea
of nuclear weapons.
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