Barend Hartman van Groningen

Barend Hartman van Groningen (before 1745 - 24 November 1806) was a Dutch Mennonite teacher and minister.
Barend served first in Haarlem at the "Vlaamse Blok" from 1761-1784, and later at the Doopsgezinde kerk, Haarlem from 1784-1806. During his service the congregations of the Haarlem Mennonite community were united (the largest were "Vlaamse Blok" and "Waterlanders") in 1784 and the sermon on this occasion based on John 15:14 was given by his colleague Klaas van der Horst.
He had been friends with Pieter Teyler van der Hulst and was named in his will as member of the Teylers First Society, a position which he filled from 1778-1806. 