William Jalby started his career first at INRIA as a researcher then joined University of Illinois (CEDAR project), got appointed Associate Professor at the University of RENNES I before joining the University of Versailles as a Full Professor. His research interests are focusing on memory system analysis and optimization, compilers and parallelism. Most of his research has been carried out in close collaboration with hardware suppliers (Fujitsu, Bull and INTEL), tools developers (JSC, TUD, University of Oregon, CAPS Entreprise) and application developers both from research (CEA, EDF, CNRS) and Industry (ESI, MAGMAsoft, Dassault, GNS, RECOM, …). Since 2004, he is the director of a joined Lab (ITACA) between CEA DAM and UVSQ focusing on code optimization techniques. In 2010, he got appointed as CTO of the Exascale Computing Research Lab and he is leading ECR research activities.