The usually undemonstrative King Frederick William IV was so delighted that he presented young Kullak with thirty Friedrichs d'or.
Kullak eventually lost Radziwill's patronage and from age thirteen to eighteen, had to make do with just occasional access to a piano.
A new aristocratic friend, Count von Ingenheim, provided a small stipend which allowed him music studies with Siegfried Dehn and Wilhelm Taubert.
Kullak played a little in Austria that year but in 1843 returned to Berlin where Fraulein von Hellwig secured him the post of pianoforte instructor to Princess Anna, the daughter of Prince Karl.
Kullak seemed subsequently to make a speciality of teaching princes and princesses of the Royal house, as well as the offspring of many upper-class families who became aware of his excellent professorial qualifications, connections and, presumably, his unimpeachable manners.
However, due to dissension in the ensuing five years, Kullak retired from his institute, which then became known as the Stern Conservatory, with Hans von Bülow as a director.
Among Kullak's many pupils were August Arnold,[4] Alfred Grünfeld, Agathe Backer Grøndahl, Heinrich Hofmann, Alexander Ilyinsky, Leonard Liebling,[5] Moritz Moszkowski, Silas Gamaliel Pratt, Julius Reubke, Nikolai Rubinstein, Xaver Scharwenka, Otto Bendix, Hans Bischoff, Amy Fay, James Kwast and Fred Werner.