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).
Herbert Huffman
At Princeton, the choir became affiliated with Huffman’s alma mater, the Westminster Choir College. Physicist Albert Einstein and his wife attended rehearsals and concerts and sometimes interacted with the students. While on tour during this period, the boys traveled on a customized bus, outfitted with school desks and a piano. In 1956, Huffman stepped aside as director of the Columbus Boychoir in order to pursue business opportunities. He nevertheless remained closely associated with the organization for the remainder of his life.