Leonel Ribeiro dos Santos is a retired Full Professor at the University of Lisbon and a Researcher at CFUL. Professor at FLUL since 1977, where he taught Social and Political Philosophy, Modern Philosophy, Ethics, Philosophy of Education and Renaissance Philosophy. He was co-founder (1993), Editor (1993-2000) and Director of the journal Philosophica (2000-2012); Director of CFUL (2008-2011); Visiting professor at UCP (Lisbon), at the University of Minho (Braga), at UTL (Degree in Landscape Architecture at IA); Visiting Professor at UNESP (Marília/SP), UFSC (Florianópolis) and UFRN (Natal).

Main works: Metaphors of Reason or the poetic economy of Kantian thought (FLUL, 1989; FCG/JNICT, 1994); The sensitive reason. Kantian Studies (Colibri, 1994); Rhetoric of evidence or Descartes according to the order of images (Quarteto, 2001; 2nd ed. CFUL, 2013); Antero de Quental – A moral vision of the World (INCM, 2002); Language, Rhetoric and Philosophy in the Renaissance (Colibri, 2004); The Spirit of the Letter. Essays on Hermeneutics of Modernity (INCM, 2007); Melancholy and Apocalypse. Studies on Portuguese and Brazilian Thought (INCM, 2008; (Italian trans.: Rome: Inschibboleth, 2017); Return to Kant: Ethics, Aesthetics, Political Philosophy (INCM, 2012); Idea of ​​a Transcendental Heuristic. Essays on Kantian Meta-Epistemology (Esfera do Caos, 2012); The Well-Tempered Reason – On the Principle of Taste in Philosophy and other Kantian Essays (University of Coimbra Press, 2022); Kant – Thinker of the Earth (Colibri, 2022).