Jacob van Gelder was the eldest son of Machiel van Gelder and Sarah de Roos. He married 12 April 1928 in Haarlem to the non-Jewish widow of Franciscus Hendrikus Jacobus van Bennekom, Dirkje Paardenkooper.
On 11 November 1942 the "Sicherheitspolizei" did a raid on the factories of Hollandia Kattenburg and all Jewish employees have been deported. Jacob van Gelder was employed there as a deputy manag…