GRIGORE C. BURDEA is Professor Emeritus at Rutgers, the State University of New Jersey, author of several books on Virtual Reality and recipient of the prestigious IEEE Virtual Reality Career Award. He is Fellow of the IEEE Virtual Reality Academy and Founder of the International Society on Virtual Rehabilitation. PHILIPPE COIFFET was a Director of Research at the French National Scientific Research Center and Member of the National Academy for Technology of France. He authored 20 books on Robotics and Virtual Reality, which have been translated into several languages.