Pierre Delage, Emeritus Professor at Ecole des Ponts ParisTech, is member of the French Academy of Agriculture and of the InSight Science Team (InSight is a NASA geophysical mission on Mars). He has been Vice-President of the French Geotechnical Group (CFMS), Chief editor of the Revue Française de Géotechnique and Géotechnique Letters, Panel member of Géotechnique and of various other journals. As former Chair of the Technical Oversight Committee of the ISSMGE (2013 – 2022), he supervised the activities of their 37 Technical Committees. Within ISSMGE, he is now in charge of the Geo-Engineers without Borders (GeoWB) committee.

He developed researches on the fundamental mechanisms governing the response of multi-phase geomaterials submitted to changes in stress, water content and temperature (for sensitive clays, deep marine sediments, unsaturated soils, compacted soils, compacted bentonite, loess, oil reservoir chalks, oil sands, geosynthetic clay liners, shales, Martian and Lunar regolith), with applications to earth-dams and embankments, deep geological radioactive waste disposal, offshore oil extraction, thermal behaviour of clays and claystones, soil contamination and seismic wave propagation.

He co-authored more than 400 papers and communications in conferences, including 142 papers in international journals and 24 invited/keynote lectures. He co-edited 12 special issues of journals or conferences proceedings, including the 1st Int. Conf. on Unsaturated Soils in Paris (1995), the 18th ICSMGE (Paris 2013) and the 3rd European Conference on Unsaturated Soils (Paris 2016), that he chaired.