Abraham van der Waeyen Pieterszen (May 14 1817 - April 16 1880) was a Dutch-born painter, trained in Antwerp. From 1844 Pieterszen worked as a deacon, later as a preacher for the Protestant Union of Belgium in Antwerp, Brussels, Mecheln and Leuven, finally in Maria-Horebeke. For 22 years, from 1857 to 1877, Pieterszen served as agent-général of the committee of evangelisation (Comitée Synodal d'Evangelisation); from 1860 to 1867 as editor of L'Union, the official paper of the Belgian Protestants, too - but this additional task proved to be too much for him.