October 21, 1801, Trier, Germany.
November 10, 1851, Higher Broughton (near Manchester), England.
Rusholme Road Cemetery (now Gartside Gardens), Manchester, England.
Mainzer was educated at the Maîtrise of Trier Cathedral. Having studied engineering, he worked in mines at Saarbrücken, but was ordained in 1826 and after a few years became an abbé. He left Germany in 1833 for political reasons, settling in Brussels, then Paris, and Britain in 1839, living first in Edinburgh, then, after 1847, in Manchester. He published the Musical Times and Singing Circular. Novello took over the publication in 1844, renaming it the Musical Times.