Universiteit Leiden

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Frans de Haas

Professor of Ancient and Medieval Philosophy / Director Dutch Research School of Philosophy

Prof.dr. F.A.J. de Haas
+31 71 527 2010

Frans de Haas is a Professor of Ancient and Medieval Philosophy / Director Dutch Research School of Philosophy at the Institute of Philosophy.

More information about Frans de Haas


My teaching is mainly concerned with influential aspects of the philosophy of Antiquity and the Middle Ages. I am interested in the reception of Plato, Aristotle, and the Stoics in late Antiquity (200-600 AD) and esp. in Neoplatonism. Philosophers in late Antiquity discuss critical questions and problems which foreshadow the reception of ancient philosophy in the Middle Ages, the Renaissance and the Early Modern period. Sometimes they have even managed to dominate modern interpretations of Plato and Aristotle.


My research focuses on the reception of Aristotle's philosophy of science, and on "philosophy of mind" in Antiquity and the Middle Ages. More specifically I am interested in the interpretation of Aristotle's Posterior Analytics, On the soul, and On sense and sensibles from late Antiquity onwards. Moreover, in this respect there is an interesting interplay between philosophy and exact sciences like mathematics and astronomy in Antiquity. My most important sources are philosophical commentaries by Alexander of Aphrodisias, Themistius, Philoponus, Simplicius, Eustratius, and Grosseteste, as well as the treatises by Plotinus and Proclus. I also study philosophical commentaries from the Renaissance, which were inspired directly by the late ancient commentaries which became available in new editions in the 15th century.

International cooperation

  • Leiden, Utrecht and Leuven cooperate in the Centre for Ancient Philosophy ( CAW in Dutch), which facilitates part of the training of MA and PhD students, and organizes regular meetings, lectures by foreign speakers etc.
  • Team leader in the European programme From natural philosophy to science (2002-2007) funded by the European Science Foundation.
  • Member and former chairman of the Academia Platonica septima Monasteriensis, a European network for research in Platonism, established in M√ľnster (Germany)

Curriculum vitae

Prof.dr. Frans A.J. de Haas (1963) studied Classics, and received his PhD in Ancient Philosophy from Leiden University (1995). He spent a year as a visiting research fellow at the Institute of Classical Studies (London) on a scholarship from the Niels Stensen Foundation. He was Research Fellow of the Royal Academy of Arts and Sciences at Utrecht University (1997-2000), and Assistant Professor of Ancient and Medieval Philosophy at Nijmegen University (2000-2002). Since 2003 he is Full Professor of Ancient and Medieval Philosophy at Leiden University; in the years 2004-2005 he was Dean of the Faculty of Philosophy. Af from September 2011 - 2017 he was Academic Director of the Institute for Philosophy

Professor of Ancient and Medieval Philosophy / Director Dutch Research School of Philosophy

  • Faculty of Humanities
  • Instituut voor Wijsbegeerte

Work address

P.J. Veth
Nonnensteeg 1-3
2311 VJ Leiden
Room number 2.18



  • Faculty of Humanities
  • Centre for the Arts in Society
  • Griekse T&C

Work address

Reuvensplaats 3-4
2311 BE Leiden
Room number 1.02a



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