Career
Originally a seamaster, Jenssen settled in Throndhjem in 1790. Here, he founded his own trading company Jenssen & Company, which evolved into a trade dynasty in the city. Jens Nicolai Jenssen left the family company in 1837 to found a rivalling company Jenssen & Sønner.
Hans Peter married a sister of John Moses, and fathered the businessman Anthon Mathias Jenssen.
