My research is in the philosophy of physics, which is the interrogation of our best theories of physics (from Newtonian mechanics to general relativity to quantum mechanics and beyond) and what they say about the nature of reality. Most of my work is on the foundations of spacetime theories, but I have also worked on quantum mechanics (especially the 'many worlds' interpretation of quantum mechanics) and other things.

More specifically, recent projects include: (i) the physics and philosophy of Roger Penrose, (ii) ultra-relativistic gravity, (iii) the foundations of quantum field theory, (iv) underdetermination in cosmology.

I have four recent books: 'The Philosophy of and Physics of Noether's Theorems' (CUP 2022), 'Special Relativity' (CUP 2023), 'Background Independence in Classical and Quantum Gravity' (OUP 2024), and 'Constructive Axiomatics for Spacetime Physics' (OUP 2025). I also have about 70 research articles in leading journals.

In the University, I lecture on the philosophy of relativity, the philosophy of quantum mechanics, and the 'advanced philosophy of physics' graduate course. In Pembroke, I give tutorials on a wide range of topics, including but not limited to: logic, general philosophy, epistemology, metaphysics, philosophy of science, philosophy of physics, philosophy of logic and language.

More information is available here:

https://users.ox.ac.uk/~orie2304/

https://scholar.google.co.uk/citations?user=VaoBs1gAAAAJ&hl=en