For any practical question, please contact first the DESY theory secretaries:

Conference Secretaries
DESY-Theory Secretariat
D-22603 Hamburg, Germany
Tel. +49-40-8998-3590 or -2413 or -1493

For any question regarding the scientific program, please contact:
Chair of organizing committee 
Prof. Dr. J. Plefka
Humboldt-University Berlin
Zum Gro├čen Windkanal 6
D-12489 Berlin, Germany
Chair of local organizing committee
E. Pomoni
DESY-Theory Group
D-22603 Hamburg, Germany