JENS MAMMEN is emeritus professor from Aarhus University, Denmark, and since 2009 honorary professor at Aalborg University, Denmark, now also affiliated the Niels Bohr Professorship Centre for Cultural Psychology. He studied Mathematics, Physics and Chemistry at the Niels Bohr Institute 1960 to 1963 and Psychology 1961 to 1968, both at Copenhagen University. He graduated in Psychology 1969 from Aarhus University as a magister with theses on cybernetic models in Psychology and experimental investigations of visual perception. He received his dr.phil. in Psychology 1983 with a thesis on the logical structure of Psyche, using Mathematical Topology. He was ass. Professor and Docent until 2000 when he was appointed professor in Cognitive Psychology, Aarhus University. He has been Dean of faculty, Head of department, Chairman of the governing board for the Danish Research School in Psychology and held several other academic posts. .