Mail Address

Leiden Observatory, Leiden University
P.O. Box 9513, NL-2300 RA Leiden
The Netherlands

Telephone and FAX

Phone (direct): +31 (0)71 527 8427
FAX: +31 (0)71 527 57431

Email Address

keller [at] strw.leidenuniv.nl

Visiting Address

Room 1126
Huygens Laboratory
Niels Bohrweg 2
NL-2333 CA Leiden
The Netherlands