Frank de Groot is Associate Professor in the Department of Chemistry at Utrecht University. His work reflects a concern with both the theoretical and the experimental aspects of X-ray spectroscopy, including both fundamental studies and applications. His current interest is in the use of X-ray spectroscopies for the study of the electronic and magnetic structure of condensed matter, in particular for transition metal oxides, (magnetic) nanoparticles and heterogeneous catalysts under working conditions. He has taught international workshops and courses on X-ray spectroscopy in Berkeley, Davis, Trieste, Grenoble, Berlin and Zurich, has given over 130 lectures and published more than 160 articles.