Main functions

2014- : director of the Descartes Centre for the History and Philosophy of the Sciences and the Humanities, Utrecht University

2011- : programme director of the  Research Master History and Philosophy of Science

2011- : programme director of the History and Philosophy of Science unit (Freudenthal Institute)

2008-2017: coordinator of the Research Focus Area History and Philosophy of the Sciences and the Humanities

2007- : full professor, Institute for the History and Philosophy of Science

2005-2007: Hendrik Muller extraordinary professor of history of science (Academy Chairs in the Humanities Foundation of the Royal Dutch Academy of Sciences)

2002-2007: associate professor, Institute for the History and Philosophy of Science

1989-2002: assistant professor, Institute for the History and Philosophy of Science

1986-1989: postdoc, Institute for the History of Science, Utrecht University

1981-1985: research assistant, Biohistorical Institute, Utrecht University

1974-1980: student biology and history of science, Utrecht University

 Additional functions

2018- : member of the Advisory Council Museum Vrolik (AMC, Amsterdam)

2016- : advisory editor Isis, Journal of the History of Science Society 

2015-:  member of the Advisory Council Committtee on Special Collections, University Library

2015- : research integrity councellor Science Faculty

2014-2016: Teaching Fellow (Research Integrity)

2013- : member of the Board of Studies of the Graduate School of Natural Sciences

2011-2013: member of the Board of Examiners of the bachelor programme Liberal Arts and Sciences

2007-2010: chairman of the Supervisory Board of the bachelor programme Liberal Arts and Sciences, Utrecht University

2006- : member of the Advisory Board of Studium Generale, Utrecht University

2005-2007: coordinator of the Dutch-Belgian History of Science Working Group

2004-2010: president of the Dutch History of Science Society

2002-2008: member of the editorial board of the Amsterdamse Boekengids (a book review journal)

1998-2002: executive editor of Gewina (the Dutch Journal of the History of Science)

1995-2001: member of the Committee for the History of Utrecht University

1995: member of the Review Panel of the Wellcomne Unit for the History of Medicine at Manchester

1987-1995: member of the Committee for the History of Geology of the Royal Dutch Academy of Sciences

1994: visiting professor, Science Studies Program, University of California San Diego (winter semester)

1991-1994: member of the Advisory Board of the Stichting Historisch Onderzoek of NWO (the Dutch National Science Foundation)

1989-1994: member of the Grant Committee for Modern History of NWO

1989-1994: executive editor of Tractrix, Yearbook for the History of Science, Medicine, Technology and Mathematics

1987-1990: executive editor of Tijdschrift voor de Geschiedenis van de Geneeskunde, Natuurwetenschappen, Wiskunde en Techniek (the Dutch Journal of the History of Science)