Louis De Geer (17 November 1587 - 19 June 1652) was a Walloon/Dutch merchant and industrialist. He is considered the father of Swedish industry for introducing Walloon blast furnaces in Sweden. He also produced cannons for the GermanProtestant movement, as well as for Dutch admirals and the Dutch East India Company and the Dutch West India Company.
Prompted by letters from his niece, Colette, who settled in Grantville shortly after the Ring of Fire, Louis de Geer backed the establishment of an industrial complex in Essen. He would later become governor-general of the Republic of Essen.