Johannes Justus Will was his real name. BVM is an abbreviation for Beatae Virginis Mariae (devotion to the Blessed Virgin Mary), and Justinus a Desponsatione was his name as a Carmelite priest.

He was an organist and composer active primarily in Germany. From 1711 to 1723, he served as the organist for his own religious order in Würzburg, and subsequently became the organist at the Carmelite monastery in Abensberg, located between Regensburg and Ingolstadt.

He left behind three pedagogical works, each a collection of short pieces such as suites (partitas) and toccatas. Some of these include brief musical examples accompanied by explanations, summarizing various performance techniques for actual liturgical and church performance. Musical forms popular at the time were also incorporated, and the surviving scores are valuable as historical materials for keyboard performance education in the pre-Baroque era.