Michel Perrin is a retired Geology Professor from École des Mines de Paris - ParisTech. After having acquired an extensive experience in various geological disciplines, he dedicated the last twenty years of his professional activity on the subject of geomodeling, collaborating with BRGM, IFP Energies nouvelles and various computer science research teams in France and other countries. His main concern has been developing practical solutions for putting geological knowledge at the center of the geomodeling process.