Dr Erno Lehtinen is a professor (emeritus) of education at the University of Turku and visiting professor at the Vytautas Magnus University, Lithuania. He has worked as a teacher and researcher in several universities in Finland, other European countries and USA, and has published more than 300 scientific publications. His research has focused on development of mathematical thinking, educational technology and new forms of expertise in rapidly changing working life. Professor Lehtinen was the Vice-Rector of the University of Turku 2003-2010 and Academy Professor (distinguished research professorship by the Academy of Finland) 2010-2014. He was awarded the honorary doctorate from the Gothenburg University (2008) and Oeuvre Award of the European Association for Research on Learning and Instruction (2009).