BIOGRAPHIES 381 ETH Diplom. 1901, second unsuccessful attempt for the Diplom, while working on a doctorate with H. F. Weber. Ca. January 1902, gave birth to daughter, "Lieserl," by Einstein. 6 January 1903, married Einstein in Bern after delays due to his parents' opposition. 1903-1909, lived in Bern. 14 May 1904, son Hans Albert born. 1909-1911, lived in Zurich. 28 July 1910, son Eduard born. 1911-1912, lived in Prague. 1912-1914, lived in Zurich. April 1914, moved to Berlin with Einstein returned to Zurich almost immediately with children. 1914-1948, lived in Zurich, often in ill health. 1916, was seriously ill and unable to care for children. 14 February 1919, divorced from Einstein. 1919-1948, took care of son Eduard during his mental illness. 1922, given Einstein's Nobel Prize money, in accordance with divorce agreement later Einstein purchased residence and income property for her. Einstein stayed with the family during his visits to Zurich. Her intellectual and personal relationships with the young Einstein played an important role in his development. Sources: Trbuhovic-Gjuric 1983 ETH Matrikel, SzZE Rektoratsarchiv correspondence with Einstein and Helene Savic. Grossmann, Marcel Hans b. 9 April 1878 in Budapest d. 7 September 1936 in Zurich ETH classmate, friend, and collaborator of Einstein. Descendant of old Swiss family. Son of a large machine-shop owner. Attended primary school in Budapest. 1893-1896, attended secondary school in Basel. 1896-1900, studied mathematics at ETH, Section VI A, where he met Einstein. 1900, Diplomarbeit on non-euclidean geometry, supervised by W. Fiedler. 1900-1901, Assistent to Fiedler. 1901, his father recommended Einstein to Friedrich Haller, direc- tor of Swiss Patent Office. 1901-1905, teacher at Thurgau Kantonsschule in Frauenfeld. 1902, University of Zurich doctoral dissertation, "Über die metri- schen Eigenschaften kollinearer Gebilde," supervised by Fiedler. 1903, married Anna Keller, with whom he had two children, Elsbeth and Marcel. 1903-1910, published three papers on non-euclidean geometry. 1905-1907, teacher at Oberrealschule in Basel. 1907-1927, professor of geometry at ETH, succeeding Fiedler. 1911, head of mathematics-physics section at ETH was involved in Einstein's 1912 appointment. 1912-1914, collaborated with Einstein on mathematical aspects of the general theory of relativity published two papers with Einstein. 1914-1918 devoted himself to aiding student prisoners of war. 1914-1920, published primarily on pedagogical and political subjects. 1916- 1917, president of Swiss Mathematical Society. 1920, developed first symp- toms of multiple sclerosis. 1922-1930, published five papers on descriptive
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