Hans Albert Einstein
Hans Albert Einstein was born on May 14, 1904 in Bern, Switzerland, where his father, Albert Einstein, worked as a clerk in the patent office. His father was of German-Jewish descent and his mother, Mileva Marić, Serbian-Orthodox. His younger brother, Eduard Einstein, was born in 1910 and died in 1965. The fate of his older sister, Lieserl Einstein, Albert Einstein's and Mileva Marić's first child, is unknown. Their parents divorced in 1919 after living apart for five years.
Albert Einstein Archives
Einstein did not save all of his written material, but from 1919, as his fame increased, he employed his stepdaughter Ilse as a secretarial assistant. Helen Dukas (1896–1982) began working for Einstein with increased systematization from April 1928, although not all outgoing correspondence was saved. After the Nazis' rise to power in 1933, Einstein's son-in-law Rudolf Kayser, aided by the French Embassy, rescued Einstein's papers in Berlin. Some of the material at Einstein's summer house in Caputh, Brandenburg was destroyed to avoid seizure, although most of his works between 1930 and 1932 were saved. That material was transported via Haberlandstrasse where Einstein lived in Berlin, then to Paris, and ended up stored in Princeton, New Jersey, United States until after Einstein's death.