During his stay in Berlin in 1764, Boswell lived in the house of Karl David Kircheisen, the president of the Berlin city council.
Johan Frederik HennertBorn 1733
Born in Berlin. Student of Mathematics under Swiss Mathematician Leonhard Euler (1707-1783) and French Mathematician and Astronomer Joseph Nicolas Delisle (1688-1768). Professor of Philosophy, Mathematics and Astronomy at the University of Utrecht (1764-?) From the 1780s he also offered public lectures on the course of rivers.1 He authored Dissertations physiques et mathematiques (1778)
Life with Boswell:
Boswell went to Hennert's inaugural lecture, De Ingenio Mathematici, at Utrecht on Frebruary 6, 1764, describing him as "lively and eloquent".