Dr Stefan Sienkiewicz

Lecturer in Philosophy


BA MSt DPhil (Oxon.)

Academic Background

I read Literae Humaniores at Christ Church, Oxford, followed by an MSt in ancient philosophy. I subsequently moved to Oriel College, Oxford, where I completed my DPhil in philosophy and taught as a college lecturer. I then spent five years as Career Development Fellow in Ancient Philosophy at Balliol College, Oxford. I am also a college lecturer at The Queen’s College, Oxford.

Undergraduate Teaching

Ancient philosophy.

Research Interests

My research interests are in ancient philosophy, with a focus to date on Sextus Empiricus and Pyrrhonian scepticism – the topic of my first book. I am currently working on two other main projects – one on anti-sceptical arguments in Hellenistic philosophy and another on the philosophy of Protagoras.



Five Modes Of Scepticism: Sextus Empiricus and the Agrippan Modes (Oxford: Oxford University Press, 2019)

Articles and book chapters:

‘The Sceptic’s Art: Varieties of Expertise in Sextus Empiricus’ in Johansen, T. (ed.) Productive Knowledge in Ancient Philosophy (Cambridge: Cambridge University Press, 2020)