Following his graduation, he became a school instructor (chiefly of mathematics and physics) in Vienna, Graz, Neusohl, Gorz, Laibach (Ljubljana), and from 1764 Klagenfurt.
The expansion continued with the construction of smelting plants in Neusohl, Arnoldstein in Carinthia, Hohenkirchen in Thuringia and Moschnitz.
Marko M. Feingold (born 28 May 1913 in Besztercebánya/Neusohl, Austria-Hungary, today Banská Bystrica, Slovakia) is the president of the Jewish community in Salzburg, Austria and is in charge of Salzburg's synagogue.