Leibniz was also occupied by turns as Boineburg's secretary, assistant, librarian, lawyer and advisor, while at the same time a personal friend of the Baron and his family.
Leibniz ay ginagamit din sa pamamagitan ng nagiging bilang Boineburg's secretary, assistant, librarian, abogado at taga-payo, habang sa parehong oras ng isang personal na kaibigan ng Baron at sa kanyang pamilya.