Photo of Björn Sjögren

Björn Sjögren

Associate Professor

I am an associate professor of education, and my research focuses on school bullying, social relationships, and students’ bystander behaviours in school.

Peer Victimization and Bullying in School

Research

School bullying is a widespread phenomenon. My research focuses on mapping the prevalence of bullying through student surveys and examining how bullying is associated with various cognitive, moral, and social factors. Together, our bullying research group aims to contribute knowledge that can help us better understand and prevent bullying in schools.

In most bullying situations, other students are present in addition to those who bully and those who are victimized. My research has a particular focus on these bystander roles. Do bystanders side with those who bully, support those who are victimized, or remain passive? And which factors influence these responses?

I am currently the principal investigator of two externally funded research projects and contribute as a researcher to one additional project.
 

Principal investigator

  • “Defending bullied peers in different ways: A longitudinal study of students’ defending behaviours as a multidimensional phenomenon”
    Swedish Research Council, 2025–2028
  • “Mental health and moral stress as causes and consequences of students’ bystander behaviours in bullying situations: A longitudinal study across five measurement occasions”
    Forte, 2025–2027
     

Contributing researcher

  • “When morality is disengaged and contributes to harassment among students at school”
    Swedish Research Council, 2026–2029
    Principal investigator: Linda Wänström, Linköping University
    ​

Teaching

I primarily teach in teacher education, including courses on educational psychology, social relationships and bullying, and research methods.

Networks

Nordic Educational Research Association (NERA)
Bullying Research Network (BRNET)

Publications

2026

Björn Sjögren, Robert Thornberg, Jun Sung Hong, Mattias Kloo (2026) Mechanisms of moral disengagement as predictors of direct and indirect bullying perpetration: a short-term longitudinal study BMC Psychology, Vol. 14, Article 1047 (Article in journal) https://dx.doi.org/10.1186/s40359-026-05156-3
Xingna Qin, Simeng Li, Björn Sjögren, Ping Ren, Robert Thornberg (2026) The Role of Parental Influences in Chinese Adolescents' Academic Achievement through Shaping Friendship Network Dynamics Journal of Youth and Adolescence, Vol. 55, p. 1142-1155 (Article in journal) https://dx.doi.org/10.1007/s10964-025-02306-5
Robert Thornberg, Björn Sjögren, Jun Sung Hong, Claudio Longobardi (2026) Longitudinal links of negative student-teacher relationships and positive class climate with traditional bullying and cyberbullying perpetration British Educational Research Journal, Vol. 52, p. 620-642 (Article in journal) https://dx.doi.org/10.1002/berj.70025

2025

Robert Thornberg, Björn Sjögren, Gianluca Gini, Tiziana Pozzoli (2025) Moral disengagement and defender self-efficacy and their associations with defending, unconcerned bystanding, and guilty bystanding in school bullying Social Psychology of Education, Vol. 28, Article 196 (Article in journal) https://dx.doi.org/10.1007/s11218-025-10156-z
Robert Thornberg, Linda Wänström, Björn Sjögren, Jun Sung Hong, Ylva Bjereld, Silvia Edling, Peter Edward Gill (2025) Well-functioning class climate and classroom prevalence of bullying victims: a short-term longitudinal class-Level path analysis Social Psychology of Education, Vol. 28, Article 158 (Article in journal) https://dx.doi.org/10.1007/s11218-025-10123-8

Organisation