Szymon Marcin Kozłowski

In 1839 – after completing schooling in Kėdainiai – he began to study at the theological seminary in Vilnius.

[2] He completed his education at the Saint Petersburg Roman Catholic Theological Academy in 1845 with a magister's in theology,[3] graduating with sumna cum laude honors.

In 1848, he was appointed a professor of church history and canon law at the Saint Petersburg Roman Catholic Theological Academy.

He was later made rector of the Vilnius Theological Academy in 1851.

While working as rector, he was made an honorary canon in 1852.