Merz was born on 26 January 1793 in Bichl, in Bad Tölz-Wolfratshausen, now in Bavaria, Germany.
[1] At the age of 15 he went to work in the glassworks recently set up by Joseph von Utzschneider [de] in the nearby deconsecrated monastery of Benediktbeuern.
On the death of von Utzschneider in 1839 Merz, in partnership with Joseph Mahler, bought the firm.
[3] After Mahler's death he ran the business in partnership with his sons Ludwig and Sigmund.
[1] In 1882 the firm passed to Jacob and Matthias Merz, Sigmund's cousins,[3] and in 1884 the Benediktbeuern works was closed.