 On August 1, 1801, August Hermann founded a publisher in Frankfurt, which operated as both a press and a retailer of books.Jacob Christian Benjamin Mohr took over the publishing house in 1804, and one year later, he and Johann Georg Zimmer founded the academic publishing house Mohr & Zimmer, which still contained both a publishing and retail division.In 1811 the Frankfurt branch was closed, and in 1815 Zimmer withdrew as partner, being replaced by Christian Friedrich Winter.