ニルス・ゲーゼ
In 1867, after having taught at the Royal Danish Academy of Music ("Københavns Musikkonservatorium") which was originally was founded in 1825 by Giuseppe Siboni (1780–1839), Hartmann helped co-establish and also direct the Academy of Music with Niels Gade (1817–1890) and Holger Simon Paulli (1810–1891).