He was born in Kristiania as a son of attorney Hans Riddervold (1869–1928) and Sophie Magdalena Haneborg.
He worked in the company Stormbull from 1924, and then started in the family-owned newspaper Aftenposten.
Outside of the media, he was a board member of Hofsfos Træsliperi og Papirfabrik from 1939.
[1] During the occupation of Norway by Nazi Germany, Riddervold was imprisoned in Grini concentration camp from 17 January to 29 July 1942.
[7] Henrik Jørgen Schibsted Huitfeldt, subeditor in Aftenposten at the time, was imprisoned from January to December 1942.