His specialist fields of research are international financial economic governance, Franco-German relations, transatlantic relations and European integration past and present. Recent publications include Waagstuk Europe: Nederland en de grote Europese vraagstukken van vandaag [The European Wager: The Netherlands and the Challenges Facing Europe Today] (Prometheus, 2014) and Reis naar het continent. Nederland en de Europese integratie, 1950 tot heden [A Trip to the Continent: The Netherlands and European Integration since the 1950s] (Amsterdam: Bert Bakker, 2013).