He was also a visiting scholar at Institute for Advanced Study (1997, 1999), the University of Paris VI and the Paris-Nord, the Hebrew University in Jerusalem, the Weizmann Institute on Clay Mathematics Institute (2003 Clay Mathematics Institute Prize Fellow) and at the IHES in Paris.
(The name came from the small wood on the estate in Bures-sur-Yvette where the IHÉS was located from 1962.)