I have a background in physics as well as philosophy and am particularly interested in erasing the boundary between them. Most of my recent work attempts to bring broadly-empirical considerations to bear on some important issues in contemporary analytic metaphysics, such as time, persistence, material composition, and vagueness. This includes physics-inspired arguments defending perdurantism, the view that material objects are four-dimensional entities extended in time as well as space and persist through time much like roads and rivers "persist" through space.

The debate about persistence is becoming increasingly focused on two topics in formal ontology, parthood and location. I am becoming increasingly interested in them too.

I am also interested in philosophy of science, philosophy of language, (serious) music, and (increasingly) skiing.

Recent publications include:

Persistence and Spacetime (Oxford University Press, 2010).

“Pegs, Boards, and Relativistic Perdurance,” Pacific Philosophical Quarterly 90: 167–75.

“Persistence and Multilocation in Spacetime,” in D. Dieks (ed.), The Ontology of Spacetime, Vol. 2. Amsterdam: Elsevier, 2008, pp. 59–81.

“About Stage Universalism,” Philosophical Quarterly 57 (2007): 21–39.

“Times of Our Lives: Negotiating the Presence of Experience,” American Philosophical Quarterly 42 (2005): 295–309.

“On Vagueness, 4D and Diachronic Universalism,” Australasian Journal of Philosophy 83 (2005): 523–531.

“Special Relativity, Coexistence and Temporal Parts: A Reply to Gilmore,” Philosophical Studies 124 (2005): 1–40.

“Presentism and Relativity: A Critical Notice,” British Journal for the Philosophy of Science 54 (2003): 327–346. Co-authored with Michel Janssen.

“Enduring and Perduring Objects in Minkowski Space-Time,” Philosophical Studies 99 (2000): 129–166.

“Zero-Value Physical Quantities,” Synthese 119 (1999): 253–286.

“Relativistic Objects,” Noûs 33 (1999): 644–662.