Anna Paulsdatter Vogt was born into an affluent family in Christiania with ties to the government in Denmark. Her father, Paul Pedersen Vogt, was originally from Denmark and was responsible for the stores at Akershus Fortress but also a merchant, mill owner, and shipowner in Christiania.
Among these enterprises were mines and ironworks, forestry, and trade. Anna"s mother, Catarina née Bauman, was the daughter of Dominicus Brau(n)man, war commissary and also in charge of the stores at Akershus. Anna married Herman Krefting on 26 October 1699, when she was only 16 years old.
The couple had at least seven children together.
Anna was widowed while she was pregnant with the last child. In particular, the ironworks at Bærums Verk grew to be the largest of its kind in Norway during her time.
But she was also responsible for purchase and sale of land, other ironworks, and mines. She also established a school for the children of her employees and contributed heavily to Tanum Church.
She was in continuous litigation with count Ferdinand Anton Danneskiold-Laurvig over rights to mine iron ore on her property on the island of Langøy outside of Kragerø.
In 1762, the main building burned down at Bærums Verk, but Krefting managed its reconstruction. Since none of Krefting"s descendants were interested in taking over her work, the property and holdings were sold on auction upon her death in 1766. Krefting"s holdings were visited by two kings, Frederik IV in 1704, and Christian IV in 1733.
Krefting also resisted the invasion by Charles XII of Sweden during the Great Northern War in 1716 by notifying Norwegian forces of the Swedish troops" dispositions.
