Margarita Mediavilla is a PhD in Physical Sciences from the University  of Valladolid (Spain) and associate professor of Systems Engineering and Automation in the School of Industrial Engineering. Her lines of research focus on energy and sustainability using system dynamics as the methodological tool. She belongs to the Research Group in Energy, Economy and Systems Dynamics of the University of Valladolid,  which is a multidisciplinary team of engineers, physicists, economists  and social scientists that works on the study of global energy  perspectives resulting from peak oil and other natural limits and  combines academic research with social divulgation. She is a member of Ecologistas en Acción, the main confederation of  environmental associations of Spain, and is a very active discloser of  the problems of the limits to growth, participating in all kinds of  publications and conferences in the Spanish area. Her personal blog (in  Spanish) is Habas Contadas.