This article relies largely or entirely on a single source. (November 2019)
Like his more famous brother Anton, Johann Nepomuk Stadler started out as an employee of the Russian ambassador in Vienna, Dmitry Mikhaylovich Galitzine (1721–1793). In February 1782 Emperor Joseph II, who did not want the Stadler brothers to leave Vienna, issued a special decree to have them hired as members of the Vienna Court Orchestra, where Johann Nepumuk Stadler played first clarinet to his brother's second. In 1801 Ludwig van Beethoven wrote the basset horn part in his ballet The Creatures of Prometheus op. 43 especially for Johann Stadler.
- Michael Lorenz: "Mozarts Patenkind", Acta Mozartiana 58, vol. 1, (June 2011), 62.