His father opened a chocolate factory in Amsterdam in 1815 , with a mill turned by laborers .
Coenraad van Houten was the son of Casparus van Houten ( 1770 -- 1858 ) and Arnoldina Koster .
Coenraad van Houten 's father opened a chocolate factory in Amsterdam in 1815 , with a mill turned by laborers .
Coenraad van Houten was the son of Casparus van Houten ( 1770 -- 1858 ) and Arnoldina Koster .