Professor at the University of Seville (Spain). Expert in methodology applied to health and behavioral sciences. Teacher in Psychometrics in the degree of Psychology and in courses related to the validation and use of psychological tests. Co-principal investigator of the Spanish team of the HBSC Study (www.hbsc.es) -which analyzes the lifestyles and health in adolescence- and co-principal investigator of the Childhood and Adolescence Opinion Barometer (www.barometro-opina.es) -that studies social and political concerns and opinions in childhood-.