He was also influential in the building of the Empress Elisabeth Bridge across the Elbe at Tetschen, a railway, a brewery on his estate in Libotschan, schools and a savings bank.
In 1828 he and his brother Josef Münzberg (1794–1867) founded a cotton spinning mill, Theresienau, in Altstadt near Tetschen.
After further foundations and takeovers, the factories, under the name Textilwerke Johann Münzberg & Co., had more than 60,000 spindles in 1876 and were thus the most important company in the industry in Bohemia.
[3] Münzberg supported the construction of the Böhmische Nordbahn [de] railway as well as the establishment of schools and a savings bank in Tetschen.
[1][4] Münzberg's descendants continued to run the textile businesses, but many factories became unprofitable and were therefore shut down or taken over by Czech entrepreneurs.