Einstein's two sons were Hans Albert Einstein and Eduard Tete Einstein. Hans Albert was born in Bern, Switzerland in May 1904. He became a professor in Berkeley (California). Eduard was born in Zürich, Switzerland in July 1910. He died at 55 years old of a stroke in the Psychiatric University Hospital Zurich "Burghölzli" . He had spent his life in and out of hospitals due to his schizophrenia.