In 1779 Unger requested a print shop for himself and in January 1780 he was granted one. Later, he expanded it to a publishing bookseller, in which he published works by Johann Wolfgang Goethe, Friedrich Schiller, Friedrich Schleiermacher as well as August and Friedrich Schlegel.
Unger's initial request for a printing shop evolved into a publishing bookstore where he published works by influential German authors such as Goethe, Schiller, Schleiermacher, and the Schlegel brothers.