You can reach the Stieltjes Institute by:

Postal Mail:
Thomas Stieltjes Institute for Mathematics
c/o University of Leiden, Mathematical Institute
P.O. Box 9512 2300 RA Leiden
The Netherlands

Telephone or Fax:
Phone: +31 71 527 7042
Fax: +31 71 527 7101

Electronic Mail:
mailto: stieltjes@math.leidenuniv.nl