 He is noted as one of the founders of the integral, and author of "Epistola de Transmutatione Curvarum Linearum in Rectus" ["On the Transformation of Curves into Straight Lines"] (1659).From 1653 he studied at Leiden University where he interacted with Frans van Schooten, Johannes Hudde, and Christiaan Huygens.In 1658 he and Hudde left for Saumur in France.