Cynthia's widowed mother was a librarian in a small Indiana town.
He was educated at the university and was librarian from 1697 to 1701.
Joachim was educated at the university of Vilna, and became in 1807 a teacher in a school at Krzemieniec in Volhynia, in 1814 teacher of history at Vilna, and in 1818 professor and librarian at the university of Warsaw.
On his return he was made titular archbishop of Tyre and librarian of the Vatican library.
In January 1757 he succeeded David Hume as librarian to the faculty of advocates, but soon relinquished this office on becoming tutor in the family of Lord Bute.