Gerard J. Massonnat is a TotalEnergies R&D Fellow, presently International Expert for Reservoir Geology and Geomodeling. After he obtained a master’s degree in Geology, he received his Ph.D. in Hydrogeology of fracture reservoirs and then was graduated from IFP School in Petroleum Engineering and Project Development.  Starting as a reservoir engineer, he was successively in charge of field monitoring and field appraisal for offshore and onshore oil fields and became team leader for multidisciplinary studies. Then he had multiple positions in R&D, for managing integrated projects on carbonate reservoirs, petrophysical synthesis, geostatistics and smart up-scaling. His work now focuses on the development of the next generation of modeling tools for both matrix and dual porosity reservoirs. Gerard has authored more than 130 technical communications in international meetings and journals and applied for 42 patents.  He served in several conferences and workshops and was Distinguished Lecturer for SPE.