Does Mathematics Require a Foundation? Arché - The Centre for Philosophy of Logic, Language, Mathematics and Mind, University of St. Andrews, Scotland, UK; 12--15 August 2002.
Foundation of the Formal Sciences IV The History of the Concept of the Formal Sciences. Rheinische Friedrich-Wilhelms-Universität Bonn, Germany; 14--17 February 2003.
PMP2002 Perspectives on Mathematical Practices, an International Conference on the Philosophy of Mathematics. Brussels University (VUB), Belgium; 24--26 October 2002.