Holtsmark was born at
Ås in
Akershus, Norway. She was a daughter of
Gabriel Gabrielsen Holtsmark (1867–1954) and his wife Margrete Weisse (1871–1933). Her father was a physicist, and her mother was an educator. She was a maternal granddaughter of philologist
Johan Peter Weisse, and a paternal granddaughter of agriculturalist and politician
Bent Holtsmark. She was a niece of politicians
Bernt and
Torger Holtsmark, and a sister of professors
Johan and
Anne Holtsmark. She married Haakon R. Brækken in July 1936, but the marriage was dissolved. ==Career==