Jacques Villain is a theoretical physicist, retired from the CEA, member of the Académie des Sciences. He was a researcher at the Centre d'Etudes Nucléaires de Saclay (1961-69) and then at the Centre d'Etudes Nucléaires de Grenoble (1970-2010), also conducting research at the ILL (Institut Laue-Langevin), at the ESRF (European Synchrotron Research Facility) and at the Institut de Physique du Solide (IFF) of the Jülich Research Centre in Germany. His research focuses mainly on condensed matter (magnetism, surfaces, crystal growth...) and statistical physics. Author of 170 scientific articles, he is also co-author of two specialized books, "Physics of Crystal Growth" (Cambridge University Press, 1998), translated from an earlier French version (Saclay-Eyrolles, 1994), and, "MolecularNanomagnets", (Oxford UniversityPress, 2006). He is also co-author of a book for the general public, "Le kaleidoscope de la Physique" (Belin, 2014).