He is known today as the first Protestant missionary to Hainan island and the translator of portions of the Old and New Testament into the Hainanese language.
After having cleared the area for other pirates, he did a two-year apprenticeship in Canton Hospital and learned enough about medicine to enable him to commence medical work in later years.
He bought Wu clan shrine and decorated it to become a church from his own money, which he had accumulated during his stay there.
The same year as Jeremiassen arrived in Hainan, he mapped the island and caused quite a stir by his travels, he was described by the natives as a "red-haired giant".
[4] Jeremiassen's life story was handed over on August 3, 1923, to Henning Haslund-Christensen and also to his old shipmate John McGregor residing in Shanghai.