Jan-Willem Van Prooijen

Professor of Radicalization, Extremism, and Conspiracy Thinking, VU Amsterdam, Netherlands

Jan-Willem van Prooijen is a behavioral scientist who received his PhD from Leiden University in 2002, and currently holds positions in Psychology and Criminology. He is Head of the Social Psychology Section at VU Amsterdam; he is Senior Researcher at the Netherlands Institute for the Study of Crime and Law Enforcement (NSCR); and, he is Endowed Professor of Radicalization, Extremism, and Conspiracy thinking at the Department of Criminal Law and Criminology at Maastricht University. His current research interests include conspiracy theories, misinformation, populism, radicalization, and other threats to democracy. Jan-Willem has published widely on these issues, in the form of peer-reviewed academic articles, pieces intended for a general audience, and books.

Last updated: Sep 05, 2026

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