In 1817 he started working in his father's merchant company "Jacob Kielland & Søn".
He passed a business exam in 1821, and as his father died the same year, Jonas took over as director of the company together with his brother Jacob.
Jonas Schanche Kielland was vice consul for Denmark in 1820, Great Britain in 1821, and the Russian Empire in 1821.
[1] He was the first mayor of Stavanger, being elected in 1837 when local government was introduced in Norway.
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