In 1815, he was appointed as a professor at the Polytechnic Institute in Vienna (now the Vienna University of Technology). He founded a library here in 1816, which he directed until 1845.
Neumann was a friend of the composer Franz Schubert.[1] Neumann adapted Georg Forster's translation of Shakuntala as a libretto for an opera, which Schubert commenced in 1820 but never competed.[2] Neumann, a liberal-minded churchman, was interested in simple music designed to appeal to "the widest possible congregation".[2] To this end, he wrote the text of 8 hymns and a translation of the Lord's Prayer, and commissioned the Deutsche Messe from his friend Schubert in 1826.