Cillian Ó Fathaigh is Research Fellow in the Department of Logic and Theoretical Philosophy at the Universidad Complutense de Madrid. His research interests are in twentieth-century Francophone philosophy and its capacity to address contemporary social and political problems.

Dr Ó Fathaigh completed his PhD at the University of Cambridge, where he was a Gates Cambridge Scholar. Before taking up his position at UCM, he was a Research Fellow on the "Spaces of Translation" project, a major AHRC-DFG funded project, shared between Nottingham Trent University and Johannes Gutenberg-Universität Mainz. He previously taught at the École Normale Supérieure de Lyon and has been a scholar at both Trinity College, Dublin, and St. John’s College, Cambridge, and an invited student at the École Normale Supérieure (Ulm). In 2021, he was a Visiting Scholar at the Interdisciplinary Centre for the History of Ideas, Vita-Salute San Raffaele University Milan. He is Communications Officer for the Society for European Philosophy. In 2022, he secured seed-funding from Una Europa to establish the “Digital Public Space Research Network”, a collaboration between UCM, KU Leuven and the University of Edinburgh.

His work has been published or is forthcoming in prestigious international journals, including The Journal of Medicine & Philosophy, Paragraph, Philosophy & Social Criticism and Derrida Today. Today. He has also co-edited two volumes:  Derrida’s Politics of Friendship: Amity & Enmity (Edinburgh University Press, 2022) and #NousSommes (Peter Lang, 2020).