Léo Borrel is a postdoctoral scholar in the Department of Nuclear Engineering at the University of California, Berkeley. His current research focuses on simulating the physics behind the scintillation mechanism in organic scintillators, using density functional theory and Monte Carlo methods. He completed in 2026 a PhD in experimental high-energy physics at the California Institute of Technology, working on Mu2e, an accelerator-based experiment that searches for neutrinoless muon-to-electron conversion in the field of an aluminum nucleus. His main contributions to the Mu2e experiment were in the assembly and testing of the electromagnetic calorimeter, the development of the analysis of the experimental data, and the theoretical study of muon-to-electron conversion in different materials. Prior to that, he received his MS in Nuclear Engineering and Engineering Physics in 2018 from a dual-degree program between École Centrale de Lyon and the University of Wisconsin-Madison. There, he developed a model for the corrosion of nuclear fuel cladding during a loss-of-coolant accident.