David Aron Spier, an inspector of the Nederlandse Veehouderij Centrale (Dutch Livestock Federation) with investigative power, was a son of the livestock trader and butcher Samuel Spier and Judith de Haas. He married 10 December 1930 in Gendringen Henrietta Heijman, a daughter of Levi Heijman and Evalina van Praag. According the municipal adminstration of Gendringen, David Aron and his newly wed wi…