Peter K. Smith is Emeritus Professor of Psychology at the Unit for School and Family Studies at Goldsmiths College, University of London. He chaired COST Action IS0801 on Cyberbullying (2008-2012), and is currently PI of a European-Indian Network project on bullying, cyberbullying, and school safety and wellbeing (2012-2015). His research interests are in social development, school bullying, play and grandparenting. Georges Steffgen is a professor at the University of Luxembourg. He directs a research group on aggression– especially violence in school and cyberbullying–as well as approaches to health promotion. He has been project manager of national and international scientific projects on violence in school and anger. He authored and co-authored more than 40 papers in international journals and books, and he is editor or co-editor of 14 books. He co-chaired COST Action IS0801 on Cyberbullying.