Hartog den Hartogs ancestors settled in Sliedrecht in the mid-19th century. Hartog and his brother Siem den Hartog played football at the local football club in Sliedrecht. They also represented a liberal party in the town council.
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Hartog den Hartog was one of the founders of football club ‘Sliedrecht’.
He was also the second chairman of the local branch of the Red Cross which was founded in 1933. His father’s name was also Hartog den Hartog and he was the first Jew who was chosen in the town council of Sliedrecht. He represented the liberal party from 5 September 1905 till 1923.
Ter Nagedachtenis, in: Blad Voetbalvereniging Sliedrecht, 1945, blz. 2
Bart Wallet Sliedrechts Israël. Een onderzoek naar de geschiedenis van de Kehillo Kedousjo Sliedrecht –een tussenbalans (Leerdam, 1995)