[1] On 5 July 1904, de Jonge married Anna Cornelia Baroness of Wassenaer (1883–1959), founder and chairman of the General Support Fund for Indigenous Persons.

[1] Responsible for maintaining Dutch neutrality in World War I, de Jonge was further appointed interim Minister of the Navy on 28 June 1918.

[citation needed] Following the end of the war, de Jonge briefly serve as an attaché to the viceroy of the Dutch colony of Surinam.

As governor-general, he was opposed to any form of Indonesian nationalism and unwilling to see the Volksraad, the semi-legislative body of the colony, play any significant role.

[2][3] He reversed the plan of his predecessor to gradually close the Boven-Digoel concentration camp, and continued to use it as a place of exile for nationalist figures.