 He emigrated to England, where he became a royal librarian at St. James's Palace, continuing to serve under William III.As a well-connected intellectual and savant, he corresponded with John Locke, with Robert Boyle, Edmond Halley and Henry Oldenburg of the Royal Society, and with Gottfried Leibniz and Antoine Arnauld.He knew John Evelyn also, and appears in his "Diary".