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retical physics, and especially for his discovery of the law of the photoelectric effect".[3] Near the beginning of his career, Einstein thought that Newtonian mechanics was no longer enough to reconcile the laws of classical mechanics with the laws of the electromagnetic field. This led to the development of his special theory of relativity. He realized, however, that the principle of relativity could also be extended to gravitational fields, and with his subsequent theory of gravitation in 1916, he published a paper on the general theory of relativity. 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 which laid the foundation of the photon theory of light. In 1917, Einstein applied the general theory of relativity to model the structure of the universe as a whole.[4] He escaped from Nazi Germany in 1933, where he had been a professor at the Berlin Academy of Sciences, and settled in the U.S., becoming a citizen in 1940. On the eve of World War II, he helped alert President Franklin D. Roosevelt that Germany might be developing an atomic weapon, and recommended that the U.S. begin similar research. He taught physics at the Institute for Advanced Study at Princeton, New Jersey, until his death in 1955. Einstein published more than 300 scientific papers along with over 150 non-scientific works, and received honorary doctorate degrees in science, medicine and philosophy from many European and American universities;[4] he also wrote about various philosophical and political subjects such as socialism, international relations and the existence of God.[5] His great intelligence and originality have made the word "Einstein" synonymous with genius.[6]