Career
In 1842, he co-founded the Tostrup & Mathiesen company, one of the largest such companies in Norway. He also owned the estate of Kjellestad. His heirs sold the Tostrup & Mathiesen company to the Mathiesen family in 1892, and it was subsequently renamed Mathiesen Eidsvold Værk, and much of the company is today continued under the name Moelven Industrier.
He was the grandfather of art collector and philanthropist Christopher Tostrup Paus.