Short answers, pulled from the story.
Johann Nepomuk Hummel arrived in the world on the 14th of November 1778 within Pressburg, Kingdom of Hungary. His father Johannes Hummel served as a violinist and music teacher before the family moved to Vienna in late 1786 or early 1787.
Wolfgang Amadeus Mozart offered free lessons to the young boy who lived with him for two years without charge. Later appointments included roles as Kapellmeister in Stuttgart from 1816 to 1818 and in Weimar from 1819 until his death in 1837.
Hummel secured the position of Konzertmeister to Nikolaus II Prince Esterházy in 1804 at Eisenstadt. He assumed many Kapellmeister duties because Joseph Haydn's health prevented full performance until May 1809 when Haydn died.
Mendelssohn, Chopin, and Schumann all showed clear signs of Hummel's harmonic structures in their early works. Schubert dedicated his last three piano sonatas to Hummel though both men died before publication allowed the dedication to stand.
Johann Nepomuk Hummel died peacefully in Weimar on the 17th of October 1837 at age fifty-eight while suffering from failing health. His grave remains located in the Historical Cemetery in Weimar where visitors can still find it.