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.

I received a DPhil in Philosophy from St John's College, Oxford University in 2019. During the DPhil, I was a Non-Stipendiary Lecturer in Political Theory at Christ Church, Oxford University. Prior to the DPhil, I read the 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


4. "Does Edificatory Perfectionism Express a Quidnunc Mentality?", in V. Kurki and M. McBride (eds), Festschrift in Honour of Matthew Kramer (Oxford: Oxford University Press, forthcoming). 

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

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

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


2. "Deontic Perfectionism" at 7th Annual Workshop for Oxford Studies in Political Philosophy, Syracuse, NY, August 2019.

1. "Does Edificatory Perfectionism Have a Quidnunc Mentality?" at Conference in Honour of Matthew Kramer, Cambridge, July 2019.