Jaan Valsiner, born in Tallinn, Estonia in 1951, is a cultural psychologist with a consistently developmental axiomatic base that is brought to analyses of any psychological or social phenomena. He is the founding editor (1995-2025) of the Sage journal, Culture & Psychology and Editor-In-Chief, Integrative Psychological & Behavioral Science (Springer, 2007-2026). After working for over three decades in USA at University of North Carolina at Chapel Hill and Clark University, he accepted in 2013 the position of Niels Bohr Professor of Cultural Psychology at Aalborg University, Denmark. Valsiner is the Head of the Competence Center on Cultural Psychology at University of Tallinn, Estonia. He focuses on theoretical innovation, with monographs The guided mind (Cambridge, Ma.: Harvard University Press, 1998, Ornamented Lives (Charlotte, NC: Information Age Publishers, 2018) and Sensuality in Human Living (Springer, 2020). He has also published a major theoretical treatise General Human Psychology (t2021 by Springer) that would synthesize William Stern's personology with his Cultural Psychology of Semiotic Dynamics.