Dr. Ruth Rebecca Tietjen is a postdoc at the Center for Subjectivity Research at the University of Copenhagen (DK), where she is working on antagonistic political emotions. Her research is situated at the intersection of the philosophy of emotion, the philosophy of religion, anthropology, ethics, and political philosophy. It is focused on the ethical and political ambiguity of religious zeal and the affective dimensions of fanaticism and populism. Moreover, she is working on existential phenomena such as loneliness, melancholy, mortality, and the limits of language. She feels committed to the idea of critically engaged philosophy: philosophy that addresses pressing problems of today’s world and aims at making an existential or political difference. Ruth is co-editor of The Philosophy of Fanaticism: Epistemological, Affective, and Political Dimensions (Routledge, forthcoming) and working on the monograph Philosophische Variationen über den Fanatismus. She published a monograph on fear and anxiety (Mentis, 2019) and articles in journals such as The Journal of the American Philosophical Association, Philosophia, and Phenomenology and the Cognitive Sciences.