He has held fellowships at the John Carter Brown Library, the Charles Warren Center at Harvard University, and the National University of Ireland. His publications include The etch in the Americas, 1600-1800 (Providence, RI, 1997) and Illicit Riches. Dutch Trade in the Caribbean, 1648-1795 (Leiden, 1998). The working title of his current book project is The Dutch in the Atlantic World: Expansion and Contraction in the Golden Age.