Rui César Vilão is Associate Professor at the Department of Physics of the University of Coimbra, as well as researcher of the Center of Physics of the University of Coimbra. He is a researcher in Condensed Matter Physics, working fundamentally in the investigation of the effects of the hydrogen impurity and of point defects in the properties of semiconductors and insulators. He is a co-author of over 70 research articles, essentially in works using positive muons as local probes of semiconductors and insulators, using the technique known as muon spin spectroscopy (µSR).