Mozart had moved to Vienna in 1781. He married the following year, and his first child was born in June 1783. He was entering the most fruitful and successful period of his life, working as a freelance musician and earning a living from commissions from patrons, performing and conducting his compositions at concerts, teaching composition and publishing his works. In December 1784 he became a freemason, and subsequently composed several masonic works. On this page Mozart listed the last two of the six quartets he dedicated to his fellow composer Joseph Haydn. Mozart and his friends performed the quartets for Haydn in January and February 1785. Mozart's father Leopold later reported Haydn as saying "your son is the greatest composer known to me either in person or by name."