i am a philosopher at uc irvine.

for the most part, i think about space and time.

some published papers:

general relativity as a collection of collections of models

on feyerabend, general relativity, and unreasonable universes

malament-hogarth machines

a remark on time machines in honor of howard stein

why be regular?

some no-hole spacetime properties are unstable

space and time

would two dimensions be world enough for spacetime?

(information) paradox regained?

on the inextendibility of spacetime

on gödel and the ideality of time

is the universe as large as it can be?

supertasks

time machines

epistemic holes in spacetime

time (hole?) machines

on spacetime singularities, holes, and extensions

the geometry of conventionality

global spacetime structure

essay review of malament (2012)

time travel: why it may not pay to work out all the kinks

what is a physically reasonable spacetime?

no no-go: a remark on time machines

on efficient time travel in gödel spacetime

on the possibility of supertasks in general relativity

on the existence of time machines in general relativity

on force in cartesian physics

is spacetime hole-free?

can we know the global structure of spacetime?

is prediction possible in general relativity?