Based on school achievements he was appointed judge at the Court of railroads and county in 1892.

Later, he was elected member of the Regional Parliament (Landtag) of Bukovina from 1911 to 1914 for Benno Straucher's Jewish National People's Party.

[1] He became the mayor of Czernowitz in 1913, after having served several years as vice-mayor, and in 1914 he was deported by the Russian occupation troops as a hostage to Siberia, whence he returned to Austria in 1916, after a hostage exchange in November 1915 between Russia and Austria-Hungary.

[4] After the dissolution of Austro-Hungarian Empire, Bukovina became a part of the Kingdom of Romania, and Weisselberger was a member of the Romanian Senate from 1922 to 1926 and of the Chamber of Deputies from 1927 to 1928.

When elected to the Senate for Czernowitz, he got 3,800 votes against 1,991 for the Social Democrat candidate, the Bundist Leon Gheller.