Carlo Rovelli was born in Verona, Italy, in 1956 and obtained his Ph.D. in Physics in Padua in 1986. In 1996, he was awarded the Xanthopoulos International Prize, for the development of the loop approach to quantum gravity and for research on the foundation of the physics of space and time. Over the years he has taught and worked in the University of Pittsburgh; Universite de la Mediterranee, Marseille; and Universita La Sapienza, Rome. Professor Rovelli's main research interests lie in general relativity, gravitational physics, and the philosophy of space and time. He has had over 100 articles published in international journals in physics and has written contributions for major encyclopedias.