Career
From 1663–1673 he opened a publishing house in Amsterdam and Rotterdam producing Socinian works, including 1665–1668 (with supplement 1692) the Biblioteca fratrum Polonorum. In 1676 he published against Spinoza"s 1670 treatise on historical criticism of the Scriptures. Kuyper was one of the most active native Dutch Socinians along with January Pietersz Beelthouwer (c1603–1665), Lancelot van Brederode (c1583–1668), Johannes Becius (1626–1690), David Willemszoon Redoch (c1633–1680), January Cornelisz Knol (d1672), Adriaan Swartepaard (1641–1691), and Foecke Floris (d1703).