As an engineer at the IPNL, Roger Genre has been involved throughout his career and beyond retirement in the laboratory’s research projects, with exceptional relevance to the issues between technical achievements and scientific results. Combining competence, high qualifications, rigour and benevolence, honesty, integrity, availability and the ability to listen, Roger left his mark on the life of the Institute and, over the last twenty years, on that of the trainees, doctoral students, researchers and engineers working at DIAM.