After the Nazis took over power in Germany in 1933 Wiesner worked in illegal underground and was arrested e.g. in the Emslandlager.[2]
After the end of World War II Wiesner was appointed the mayor of Stettin on 26 May 1945 by Red Army authorities but was forced to leave office after the city was handed over to Poland on 5 July 1945.
From August till December 1945 Wiesner was the mayor of Schwerin and later held several positions within the Communist party and the Socialist Unity Party of Germany (SED). He was the head of the district administration (Landrat) of Güstrow in 1950-52 and worked for the official newspaper of the SED (Schweriner Volkszeitung) in Schwerin in 1952-64.[2]