Ursula Hess is Professor of Psychology at the Humboldt-University, Berlin. She has published numerous articles in scientific journals as well as chapters in edited volumes. She is co-editor of a textbook on research methodology (Méthodes de recherche en psychologie, Gaëtan Morin, 2000) and author of a textbook on motivation and emotion (Motivation und Emotion, Kohlhammer, forthcoming). She has co-edited two book on emotion communication (Group Dynamics and Emotional Expression, Cambridge University Press, with Pierre Philippot, 2007; Emotional Mimicry in Social Context, Cambridge University Press, with Agneta Fischer, 2016). Shlomo Hareli is a Professor of Social Psychology at the University of Haifa. He has published numerous theoretical and empirical articles in scientific journals as well as chapters in edited volumes.