He left Cologne in 1935, after the imposition of the Nuremberg Laws, and returned to his mother's home in Berlin.
After the war, he received an invitation to return to Cologne, but instead moved to the University of Ankara in 1947.
[1][4] He was married briefly twice, to Malla Jessen in 1927 and to Vera Schereschevsky two months prior to his death in 1956.
His attribution remains in place today, and his solution of the Carathéodory conjecture in the real analytic case is regarded as complete.
[1] After the war, Hamburger's research primarily concerned linear transformations of Hilbert space.