Jacques Hartog was the son of Hartog David Hartog and Rebecca Wijnbergen. He lived in Eindhoven until he was twenty, and he attended the HBS (modern grammar school) there. From 1919 to 1923, he lived in the Dutch East Indies, where he worked for the metals company Enthoven-Hartelust, first as deputy director and later as director. After he returned to the Netherlands, he lived in The Hague, starti…