Franz Joseph Haydn (1732-1809) was an Austrian composer known as the "Father of the Symphony" and "Father of the String Quartet". He spent much of his career as a court musician for the wealthy Esterházy family in Eisenstadt, Austria. During this time, he isolated from other composers and developed his unique musical style, producing many symphonies, string quartets, and other works. In later life, Haydn formed a close friendship with Mozart and taught Beethoven. He also traveled to London where he composed 12 symphonies to great success. Haydn was one of the most prolific and prominent composers of the Classical period until his death in 1809.