Jean-Louis Barrat graduated from ENS Paris, and obtained his Ph.D. from Université Pierre et Marie Curie (Paris VI) in 1987. He was a postdoc at the TU in Munich and at UCSB, and worked as a CNRS associate at ENS Lyon. He is now a professor at the University of Lyon, where he heads the condensed matter theory group. His research interests cover application of statistical physics and computer simulation to various aspects of material sciences, e.g. interfaces, glasses and amorphous systems, clusters, and polymers. Jean-Pierre Hansen obtained a Ph.D. in Physics at the Université de Paris-Sud in 1969, and was appointed Professor of Physics at Université Pierre et Marie Curie (Paris VI). In 1987 he moved to the newly created Ecole Normale Supérieure de Lyon, where he headed the Physics Department until 1997, when he was appointed to the Chair of Theoretical Chemistry at Cambridge University. He was elected Fellow of the Royal Society in 2002. J. P. Hansen has made important contributions in statistical mechanics of simple and complex liquids, of quantum fluids and of dense plasmas.