Hans Einstein
Einstein was born in Berlin, the son of Josefa Spiero Einstein Warburg and Dr. Fritz Einstein. He spent his childhood in Hamburg, Germany as Nazism gradually took hold. His parents were Quakers, but of Jewish origin. A year after Hitler took power in 1934, his mother moved Einstein and his sister to the Netherlands, leaving his father behind. He finished high school at Eerde, a boarding school in the Netherlands at age 16 and moved to the United States as an exchange student. He attended Furman University in Greenville, South Carolina. One of the first things he did upon arriving was look up his last name in the phone book. The only Einstein he found was a relative: Albert Einstein's son, Hans Albert Einstein. They became friends and he was often invited over whenever Albert visited. He earned his medical degree from New York Medical College in 1946 and did his internship at Paterson General Hospital in Paterson, New Jersey. Following that, he became a medical officer in the United States Army. He then completed residencies in Internal Medicine and Pulmonary Diseases at the New York Veterans Hospitals.
Maximilian Herzberger
Maximilian Herzberger was the son of Leopold Herzberger (born 7 Mar 1870, Krefeld — died in Rochester (NY)) and Sonja/Sofia Behrendt/Berendt/Berends (22 Mar 1876, Petersburg (Germany) — 28 Jan 1945, Florence); he had a sister Olga (24 Sep 1897, Berlin — 2 Aug 1922, Berlin). The family was Jewish.
He studied mathematics and physics at the Berlin University, where Albert Einstein was one of his professors, and later became a friend and advisor.
In 1923, Herzberger finished his Ph.D. thesis "Ueber Systeme hyperkomplexer Grössen" under Ludwig Bieberbach and Issai Schur at the philosophical faculty.
In 1925, he married Edith Kaufmann (10 Oct 1901, Stuttgart — 16 Feb 2001, Carlsbad (California) or New Orleans);
they had three children, born in Jena, viz. Ruth (born 1928), Ursula Bellugi (1931), and Hans (6 Aug 1932, spouse of Radhika Herzberger).
No later than Sep 1930, he was assistant of Hans Boegehold, the chief of calculation office at Carl Zeiss Jena.