David Touitou has been working in the IT field for 15 years now. He started (fixing Novell Netware 3.12 servers) even before graduation. He has gone through tiny local companies around Paris to big ones (the leader in BI), also from web design to infrastructure management.
His previous job was to design and manage the R&D datacentre of a software vendor (800 servers, 39 racks in 2003, multi-vendors VPN with the rest of the world), while doing some high-level support in networking for the developing teams.
As CTO (and owner) of Network Studio, he is still working around datacentres, designing and managing infrastructure for customers (from SMB to the EU Council). His company were one of the first to spread the Zimbra word in France (beginning of 2006) and currently have several customers with several thousands of Zimbra licenses up and running.