I am a postdoc in the System and Network Engineering group, lead by Cees de Laat. I work on security and privacy in distributed systems. I lead the security and privacy subprogram of the Dutch project COMMIT, previously the Virtual Laboratory for e-Science (VL-e), among several other things.
My address is:

Faculty of Science, Informatics Institute,
University of Amsterdam,
Science Park 904, room c3.153
1098XH Amsterdam, The Netherlands
Tel. +31 - 20 - 525 5266 / 06 - 14 79 27 88

My mail address uses the name 'guido', and behind the 'at' sign comes 'science.uva.nl'.
For publications, see my publication list, and the list of (invited) talks.
Some information about the EPD system can be found here.
I used to work in the computer systems group at the Vrije Universiteit.

I co-supervised Matthijs Koot's PhD research on data anonymity. Some of his papers can be found here. Prof. Latanya Sweeney gave a talk on privacy protection after the defense, on June 27 2012.