Dr. Waller is the Principal of Harris Manchester College and a Pro Vice Chancellor of the University of Oxford. He is also the Director of the Farmington Institute. He is an Honorary Fellow of Homerton College, Cambridge and is the MacWilliams Fellow in Divinity at the University of Wales, Trinity St. David. He is a trustee of several charitable trusts and an Ecumenical Canon of Christ Church Cathedral, Oxford.
His research interests are in the field of Religious Thought in the eighteenth and nineteenth centuries.