Professor Olivier Guillon studied materials science and engineering at the Ecole des Mines d’Alès and completed his PhD on the non-linear behaviour of ferroelectric ceramics in France. He then joined, as a post-doc researcher, the group of Professor Jürgen Rödel at TU Darmstadt, Germany. Focusing on constrained sintering, he also visited the group of Professor Raj Bordia at the University of Washington (USA) and established in Darmstadt a DFG funded Emmy Noether Group on new ceramic processes. After spending two years at the Friedrich Schiller University of Jena as Professor of Mechanics of Functional Materials, he became Director at the Institute of Energy and Climate Research - Materials Synthesis and Processing (Forschungszentrum Jülich, Germany) and Professor at the RWTH Aachen University in 2014. His research interests encompass thermal barrier coatings and ceramic matrix composites, solid oxide fuel/electrolysis cells, gas separation membranes and batteries. The development and processing of solid electrolytes for lithium and sodium ions and their integration into all-solid-state batteries play a key role in this regard.