He is a member of the 21s century Center of Excellence program on "Trustworthy e-Society" at JAIST. Xavier obtained the Ph.D. in Computer Science in 2000 from the Swiss Federal Institute of Technology in Lausanne (EPFL) under the supervision of Prof. Andr'e Schiper. In the summer 2005, Xavier was an invited professor at the IRISA and the University of Rennes 1 (France). He served on the program committee of several international conferences on dependable computer systems, including DSN, SRDS, ISORC, and LADC. He is also responsible for the track on ``dependable and autonomic computing'' of the AINA 2006 conference. His research interests include distributed algorithms, fault- tolerant distributed systems, mobile ad hoc networks, as well as their application to cooperative autonomous mobile systems.