He is an assistant professor of Criminology and member of the Studies Committee of Criminology at the University of Barcelona, Spain. He holds a bachelor’s degree in Criminology and a PhD in Psychology from the same university. Since 1998, he is a regular lecturer at governmental police and penitentiary training institutions in Catalonia, which also has a track record on teaching on topics related to juvenile and adult crime, criminal careers, criminological theories, public safety and security management. David has led and participated in various research lines about such topics, supported by research projects funded through competitive public calls. He regularly participates in professional conferences and seminars related to criminological science and has appeared as an expert in the regional parliaments of Basque Country and Catalonia in matters related to these issues; he has also published several articles in some of the most important criminological journals in the Hispanic world (i.e., Revista Española de Investigación Criminológica or Revista de Derecho Penal y Criminología). He is the current president of the Catalan Society of Criminology.