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Sent 1: In October 1933 Einstein returned to the U.S. and took up a position at the Institute for Advanced Study (in Princeton, New Jersey), noted for having become a refuge for scientists fleeing Nazi Germany.
Sent 2: At the time, most American universities, including Harvard, Princeton and Yale, had minimal or no Jewish faculty or students, as a result of their Jewish quota which lasted until the late 1940s.
Sent 3: Einstein was still undecided on his future.
Sent 4: He had offers from several European universities, including Oxford where he stayed for three short periods between May 1931 and June 1933, however in 1935 he arrived at the decision to remain permanently in the United States and apply for citizenship.
Sent 5: Einstein's affiliation with the Institute for Advanced Study would last until his death in 1955.
Sent 6: He was one of the four first selected (two of the others being John von Neumann and Kurt Godel) at the new Institute, where he soon developed a close friendship with Godel.
Sent 7: The two would take long walks together discussing their work.
Sent 8: Bruria Kaufman, his assistant, later became a physicist.
Sent 9: During this period, Einstein tried to develop a unified field theory and to refute the accepted interpretation of quantum physics, both unsuccessfully.