Nettrek is a scientific research group focused on network research situated at Tilburg University and Jheronimus Academy of Data Science (JADS), The Netherlands. Our team members have a diverse background in statistical modeling (Bayesian and classical), artificial intelligence, and the social and behavioral sciences. We develop novel statistical and data scientific methods for social network research to better understand social network dynamics from empirical data. Our methods have been applied to learn about information sharing between employees in organizational networks, about real-time changes in communication structures during the Appollo 13 mission as a results of interventions or problems (“Houston, we have a problem!”), about drivers of violent interactions between criminal gangs, about the temporal development of social relationships between freshmen, and about classroom dynamics between children and teachers to investigate how disorder arises and dissolves, among others.