1972 – … Editor of Simiolus, Netherlands Quarterly for the History of Art

1990 – … Chair for Art History at Utrecht University

1998 – … Member of the Board of the Rembrandt Association

2009 – … Fellow of the Rembrandt Association

1976 – 1990 Assistant professor for Art History at Utrecht University 

1989 – 1990 Guest curator at the Rijksmuseum

1995 – 2007 Director of the Dutch Postgraduate School for Art History

2008 – 2009 Guest curator at the Van Gogh Museum

2010 – 2011 Guest curator at the Museum Boijmans Van Beuningen in Rotterdam