João Branquinho took his doctorate at the University of Oxford, where he studied with Tim Williamson. He is presently Full Professor of Philosophy at the Faculty of Letters of the University of Lisbon, where he teaches Logic, Metaphysics and Foundations of Cognitive Science, and a researcher at the Philosophy Centre, where he coordinated for nearly 20 years the LanCog (Language, Mind and Cognition) Research Group. A past President of the European Society for Analytical Philosophy (2002-2005), João edited the book The Foundations of Cognitive Science (Oxford University Press: 2002) and co-edited the book Enciclopédia de Termos Lógico-Filosóficos (Martins Fontes: 2006). His areas of specialization are: Philosophy of Language and Semantics, Metaphysics, Foundations of Cognitive Science. João has published several articles in peer-reviewed international journals such as Analysis and Philosophical Perspectives. He founded, edited and co-edited (with Teresa Marques) the international journal of philosophy Disputatio. His current work is on the dynamics of indexical belief, the nature of modes of presentation, the relations between rigid designation and content, the scope and nature of metaphysical necessity, and the nature of existence.