Jean-Paul Linnartz is senior scientist with Philips Natuurkundig Laboratorium (Nat.Lab.), Eindhoven, 
The Netherlands, where he leads a team of researchers developing watermarking, copy-control, and 
conditional access systems. He also is affiliated with the Department of E.E.C.S. of the University of 
California at Berkeley, U.S.A. as an Assistant Adjunct Professor. Previously, he was Associate 
Professor at Delft University of Technology, The Netherlands, and researcher with the Netherlands 
Organization for Applied Scientific Research. He is Editor-in-Chief of a scientific CD ROM journal on 
wireless communication. His PhD dissertation addressed random access to radio networks.