I am a Junior Research Fellow in Philosophy at Merton College, Oxford University. My research focuses on contemporary theories of liberalism. In particular, I am interested in various principles of liberal political morality, such as the harm principle, the principle of state neutrality, and the public justification principle.

Prior to this, I read a DPhil in Philosophy at St John's College, Oxford University (2017-19), a BPhil in Philosophy at The Queen's College, Oxford University (2015-17), and an undergraduate degree in Philosophy, Politics and Economics at Lincoln College, Oxford University (2012-15). 

Email: collis.tahzib@philosophy.ox.ac.uk


1.."Pluralist Neutrality", Journal of Political Philosophy 26 (2018), pp. 508-32.

2.."Perfectionism: Political not Metaphysical", Philosophy & Public Affairs 47 (2019), pp. 144-78.

3.."Does Social Trust Justify the Public Justification Principle?" Journal of Applied Philosophy (forthcoming).

4.."Perfectionist Duties", in D. Sobel, P. Vallentyne and S. Wall (eds), Oxford Studies in Political Philosophy Volume 7 (Oxford: Oxford University Press, forthcoming). 

5.."Does Edificatory Perfectionism Express a Quidnunc Mentality?", in V. Kurki and M. McBride (eds), Without Trimmings: The Legal, Moral, and Political Philosophy of Matthew Kramer (Oxford: Oxford University Press, forthcoming). 

6.."Do the Reactive Attitudes Justify Public Reason?" European Journal of Political Theory (forthcoming).