Hans Christian Ørsted was a Danish physicist and chemist who discovered that electric currents create magnetic fields, which was the first connection found between electricity and magnetism. Oersted's law and the oersted are named after him.
A leader of the Danish Golden Age, Ørsted was a close friend of Hans Christian Andersen and the brother of politician and jurist Anders Sandøe Ørsted, who served as Prime Minister of Denmark from 1853 to 1854.
Wikipedia
Relating his discovery of the magnetic effect of an electric current, in "Experiments on the Effect of a Current of Electricity on the Magnetic Needle", Annals of Philosophy 1820, vol. 16, pp. 273-277.
