He joined the Communist Party and went into exile in the Soviet Union in 1931, returning to Germany in 1945.
In 1946, he became a co-founder of DEFA, the East German state-owned film studio, as well as one of its directors and board members.
Hans Klering was married to Else Korén and Antonia Nizkowskaja.
He was a member of several agitprop theater groups in Cologne and Berlin, including the Rote Raketen (Red Rocket), Blaue Blusen (Blue Blouse), and the Left Column.
As the political situation in Germany worsened, Klering fled to Moscow in 1931, where he continued to work with the Left Column.