In 1997 Degree in Psychology (Diploma) at University of Bremen, Germany; Post-Graduate PhD scholarship by "Kommission für Forschungsplanung und wissenschaftlichen Nachwuchs (FNK)" at University of Bremen. 1999-2004 Research Fellow at "Zentrum für Klinische Psychologie und Rehabilitation" (ZKPR), University of Bremen. Until February 2001 Staff Member at "Kinderschutzzentrum des Deutschen Kinderschutzbundes e.V. (Landesverband Bremen) ". In 2003 PhD in Psychology at University of Bremen. From April 2004 to March 2010 "Juniorprofessor" (Assistant Professorship) for Educational and Developmental Psychology and since April 2010 "Univ.-Prof." (Full Professorship) for Developmental and Clinical Psychology at Freie Universität Berlin, Germany. Head of the Division "Developmental Science and Applied Developmental Psychology". Since 2005 Faculty Associate and since 2006 Faculty Member at the International Max Planck Research School "The Life Course: Evolutionary and Ontoge-netic Dynamics" at Max Planck Institute for Human Development, Berlin. Since 2004 advisory function and since 2007 member of the Scientific Advisory Council of the "Stiftung Deutsches Forum für Kriminalprävention (DFK)". Member of several Scientific Advisory Boards (e.g. buddY E.V.) and Scientific Networks (e.g. EU COST-Aktion Coping with Cyberbullying). Experiences in the development, evaluation, and implementation of violence preventive intervention programms and early intervention programs, e.g. in preschool (www.papilio.de), school (www.fairplayer.de, www.netwass-projekt.de, www.medienhelden-projekt.de), in extracurricular (www.fairplayer-sport.de), and family environment (www.coda-programm.de). Since 2006 Chair Person of the friendly society "fairplayer e.V.". Since 2007 Editor-in-Chief of the European Journal of Developmental Science (since 2011 renamed as International Journal of Developmental Science).