I am a social-behavioral scientist with a background in sociology. I am an Associate Professor at the Department of Sociology, University of Copenhagen, and Senior Research Fellow at Netherlands Institute for the Study of Crime and Law Enforcement (NSCR). My research is transdisciplinary and spans the areas of micro-sociology, social psychology, criminology, and ethology. Methodologically, my expertise lies in quantitative research, particularly in combination with techniques for naturalistic video observation. My current research focuses on the situational forces that shape interpersonal violence. More specifically, my interest concerns the role of third-party bystanders in violent encounters, especially with respect to how and why they intervene and often successfully de-escalate aggressive incidents. Moreover, I have recently studied citizen compliance with COVID-19 measures, such as social distancing, curfews, and face-mask use.