Theodor Kjerulf (30 March 1825 – 25 October 1888) was a Norwegian geologist and poet.He was born in Christiania, and was the brother of Halfdan Kjerulf. He was educated in the Royal Frederick University and subsequently studied at Heidelberg, working in Robert Bunsen's laboratory.[citation needed] In 1858, he was hired as a lecturer at the Royal Frederick University. In the same year, he became director of the Norwegian Geological Survey, which he had been instrumental in establishing. In 1866 he was promoted to professor of geology.