Marcel Guà rdia (PhD in Applied Mathematics, Universitat Politècnica de Catalunya, 2010) is Associate Professor (Professor Agregat) at Universitat Politècnica de Catalunya and affiliated member of the Centre de Recerca Matemà tica. He has held postdoctoral positions in the Pennsylvania State University, the Fields Institute (Toronto), the University of Maryland, the Institute for Advanced Study (Princeton) and Université de Paris 7 âEUR Denis Diderot.