In late 1928, Arvid Harnack left for Germany. Mildred joined him the following year. They settled in 1930 in Berlin, where Mildred worked at the University while completing her doctorate (she received it in 1939, with her dissertation Entwicklung der amerikanischen Literatur der Gegenwart), and Arvid received his second law degree. The images below of photographs published by the Gedenkstätte Deutscher Widerstand show, respectively, the couple in Berlin in 1929 and in Saalfeld in 1931.