Farhang Radjaï is a CNRS Research Director at the Mechanics and Civil Engineering Laboratory (LMGC) at the University of Montpellier 2. His research focus is on granular physics to which he contributed by the numerical modeling and discovery of the bimodal structure of force chains.

Frédéric Dubois is a Research Engineer at the Mechanics and Civil Engineering Laboratory (LMGC) at the University of Montpellier 2, France. He is an expert in the field of modeling complex mechanical systems in interaction (contact, friction, adhesion, etc.).