Danish-born geologist Harald Ingemann Jensen was educated at Brisbane Boys Grammar School and the University of Sydney, where he earned a BSc with honours in geology in 1904 and was awarded a D.Sc and the university medal in 1908. He was an active member of the Labor Party and wrote regularly for Labor and union journals on politics, economics and mining. He worked as a government geologist in Queensland from 1917 to 1922. From 1923 to 1938 he was principally engaged in seeking oil in the Roma basin, Queensland, and in the Mandated Territory of New Guinea. He had an early interest in weather prediction which he returned to from 1943. This led him to work for a time with Inigo Jones at his Crohamhurst laboratory. He died in Brisbane in 1966.