I am a full professor of philosophy in the Department of Philosophy at the University of Geneva.

My current research focuses on the philosophical foundations of quantum gravity. More generally, I work in the philosophy of physics, which heavily intrudes into metaphysics and general philosophy of science. Specifically, I work on space and time, time travel, persistence, identity, laws of nature, determinism, and causation.

My Erdös Number is 3 (Erdös → Tarski → Andreka and Nemeti → me).

• If you are a prospective graduate student and consider doing a PhD under my supervision, please read this before you contact me.
• If you would like to share your work with me because you think it might be of interest to me, feel free to contact me. But please don't expect an answer--I get way too many such messages to reply to all of them--let alone to read all the papers sent my way.
• Please note that I do not endorse people I don't know or whose work I don't work for the arXiv.

I have recently published a book with Nick Huggett, which appeared in March 2025 with Oxford University Press. It starts out from the recognition that in quantum theories of gravity, spacetime disappears in some sense or other and investigates the philosophical implications of a fundamentally non-spatiotemporal world, as well as how spacetime is thought to re-emerge in various of the main approaches to quantum gravity.

I am currently also working on a book with JB Manchak and Chris Smeenk, also under contract with Oxford University Press. This will be a research monograph in naturalistic philosophy of time on the possibility of time travel and time machines in modern physics, and particularly in general relativity.