Elizabeth Roboz Einstein
Roboz married Hans Albert Einstein, first son of physicist Albert Einstein, and professor of hydraulic engineering at the University of California, Berkeley, in June 1959. They did not have any children together, although Hans had four children from his first marriage to Frieda Knecht, only two of whom survived into adulthood. Hans died on July 26, 1973, and Roboz wrote a biography of him, "Hans Albert Einstein: Reminiscences of his Life and our Life Together" (1992).
Zoellner Quartet
More than a dozen years later, in January 1931, Albert Einstein, who was then engaged in research at the California Institute of Technology, visited the Zoellner family's conservatory and played violin with members of the quartet in music of Beethoven and Mozart. The following year, a few days before Einstein sailed for what would be his last visit to Germany, he presented Joseph Zoellner with an autographed photograph as a memento of the occasion.