(Franz) Joseph Haydn (; German: ['jo:zef 'haId@n] ( listen); 31 March 1732 - 31 May 1809) was an Austrian composer of the Classical period. He was instrumental in the development of chamber music such as the piano trio and his contributions to musical form have earned him the epithets "Father of the Symphony" and "Father of the String Quartet".

Haydn returned to Vienna in 1795. Prince Anton had died, and his successor Nikolaus II proposed that the Esterhazy musical establishment be revived with Haydn serving again as Kapellmeister. Haydn took up the position on a part-time basis. He spent his summers with the Esterhazys in Eisenstadt, and over the course of several years wrote six masses for them.  By this time Haydn had become a public figure in Vienna. He spent most of his time in his home, a large house in the suburb of Windmuhle, and wrote works for public performance. In collaboration with his librettist and mentor Gottfried van Swieten, and with funding from van Swieten's Gesellschaft der Associierten, he composed his two great oratorios, The Creation (1798) and The Seasons (1801). Both were enthusiastically received. Haydn frequently appeared before the public, often leading performances of The Creation and The Seasons for charity benefits, including Tonkunstler-Societat programs with massed musical forces. He also composed instrumental music: the popular Trumpet Concerto, and the last nine in his long series of string quartets, including the Fifths, Emperor, and Sunrise. A brief work, "Gott erhalte Franz den Kaiser" (the "Emperor's Hymn"; 1797), achieved great success and became "the enduring emblem of Austrian identity right up to the First World War" (Jones); in modern times it became (with different words) the national anthem of Germany.  During the later years of this successful period, Haydn faced incipient old age and fluctuating health, and he had to struggle to complete his final works. His last major work, from 1802, was the sixth mass for the Esterhazys, the Harmoniemesse.

Answer the following question by taking a quote from the article: Did he do anything significant while doing this job?
He spent his summers with the Esterhazys in Eisenstadt, and over the course of several years wrote six masses for them.