He also has a PhD in Law by the Universidad de Navarra which he obtained with the Summa Cum Laude mention (1998), Post-Doctorate studies in the Institute for Criminal Law of the University of Bonn (Germany), [Alexander von Humboldt-Stiflung scholarship recipient]. He has several research stays at the University of Navarra, the University of Bonn and Pompeu Fabra University of Barcelona (Spain).