Óscar L. González-Castán has since 2021 been Full Professor of Philosophy at the Department of Logic and Theoretical Philosophy, Complutense University of Madrid. He studied Philosophy at the Complutense University of Madrid and was awarded an MA in 1987 and a PhD in Philosophy in 1993. He has been Adjunct Professor at the University of Saint Louis at the College of Arts and Letters (Madrid Campus, 1994-1995), at the College for International Studies, Endicott College (1995-2001), and at the University of Alcalá, Spain (1997-2001), as well as Lecturer at the Complutense University of Madrid (2006-2021). He was an International Research Assistant at the University of Wisconsin-Madison in 1989-1990 and was awarded a post-doctoral scholarship at the University of Notre Dame (Indiana) in 1992-1993. He has also been Visiting Philosopher at the University of Oxford several times thanks to a grant from the Spanish Ministry of Education and Culture (Mobility Program for University Professors 2016) and the invitation of Professor Timothy Williamson (Wykeham Professor of Logic at the University of Oxford). More recently, he has been Visiting Scholar in the Department of Philosophy at the University of California, Santa Barbara (UCSB) with support from the Complutense University-Jaime del Amo Foundation (2018).

Since 1996 he has been a Research Fellow in a number of different competitive Research Projects. At present, he is the PI of the Research Project "Cognitive Vulnerability (II): Interest, Inquiry, and Asymmetric Knowledge" of the Spanish Ministry of Science and Innovation (PID2022-138306NB-100). He has also been Vice-Dean of Studies in the Faculty of Philosophy of the Complutense University of Madrid (2010-2014). He established the Double Degree in Philosophy and Law.

His areas of interest include epistemology, philosophy of science, phenomenology, and philosophy of mind. He has published books and several articles on these subjects in international journals such as Tecnos, Rodopi, Wittgenstein Studien, The Journal of Value Inquiry, Phänomenologische Forschung, Trotta, De Gruyter, Plaza y Valdés, Teorema, Isegoría, and Revista de Filosofía among others. His books include Wandering Consciousness: A Critical Introduction to Philosophy of Psychology (in Spanish) (Madrid: Tecnos 1999), and The Many Directions of Moral Consciousness (in Spanish) (Madrid: Universidad de Alcalá 2003). His most recent book is:

González-Castán, Óscar L. (ed.) (2023), Cognitive Vulnerability: AnEpistemological Approach, in Berlin Studies in Knowledge Research, Günter Abel and James Conant (series editors). Berlin: Walter de Gruyter. ISBN: 978-3-11-079906-4.