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 am also currently finishing up a DPhil in Philosophy at St John's College, Oxford University, to be examined in December 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


1. "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.

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


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

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