Associate Professor
String Theory Group
Institute for Theoretical Physics
Valckenierstraat 65, J/K 3.47
1018 XE Amsterdam,
The Netherlands.
and
Korteweg-de Vries Institute for Mathematics
Science Park 904
1098 XH Amsterdam
The Netherlands
Tel: +31 (0)20 525 5745
Fax: +31 (0)20 525 5778