Christopher Roser

Christopher Roser


Ancient Philosophy
Moral Responsibility
Social Epistemology


Current Projects: 

My research focuses on the nature and value of rationality, reasons and argumentation. I address these issues in the setting both of Ancient Philosophy and current epistemology and ethics. Currently, I work on the roots of our understanding of moral responsibility in Classical Antiquity, in and before Aristotle, and on the question in which way rationality and moral responsibility are interconnected. I am also interested in topics in social epistemology, such as the epistemic justice, fake news and the value of arguing with others.

Curriculum Vitae 

Fellowships and Positions


2020-2021 Lecturer in Philosophy at the Humboldt University Berlin (Wissenschaftlicher Mitarbeiter)

2020 Research Fellow at the Cluster “Philosophy, Science and the Sciences”, Humboldt University Berlin

Doctoral Fellowship by the German Research Foundation (DGF), Humboldt University Berlin

Cambridge Trust Scholarship



2019 Humboldt University Berlin, PhD in Philosophy, Graduate Program of Ancient Philosophy

Title: The Epistemic Value of Logos. Gorgias, Isocrates and Plato on the Possibility of Giving Reasons to Others

2012    University of Cambridge, MPhil in Classics

2011    Ludwig-Maximilian University Munich, MPhil in Philosophy, Logic, and Theory of Science

2010    University of Oxford, Queen’s College, Visiting Student in Philosophy

Further Research Visits:

Columbia University, New York (Visiting Scholar)

University of Toronto (Visiting Graduate Student)

University of Chicago (Guest Lecturer)


Essays on Argumentation in Antiquity, co-edited with Jospeh Bijelde and David Marry, Springer Press, 2021 (

Chapters in books:

What is the Difference Between the Dialectical and Rhetorical Use of Arguments? A Paradigm-Based Approach to Plato’s Socrates, Essays on Argumentation in Antiquity, 2021 (Link:


Invited Talks

Epistemic Blame. Humboldt University Berlin,

Plato’s Account of Rational Persuasion. University of Bergen

Logos and Rationality in Plato. University of Bonn

Rational Persuasion in Plato’s Gorgias. University of Chicago.

The Link between Argumentation and Rationality in its Ancient Beginnings, University of Windsor, Colloquium of the Centre for Research in Reasoning, Argumentation and Rhetoric

Reasoning and its Role in Gorgias. University of Toronto

Why (still) argue? University of Art and Design Burg Griebenstein Halle


Plato’s Notion of Validity. A Dialectical Approach, Begriffe der Logik – Logik der Begriffe, University Leipzig

The Roots of the Problem of Free Will, XXV. Congress of the German Society for Philosophy

On the Relation between the Forms and Dialectic in Plato’s early dialogue, IUC Dubrovnik

On the Role of Rationality and Logos in the Quarrel between Rhetoric and Philosophy, Études Platoniciennes, 5th SEP international Workshop, ENS Paris

Gorgias and Plato on the Distinction Between Being Rational and Being Irrational, 34th joint meeting of The Society for Ancient Greek Philosophy (SAGP), Fordham University, New York.