i am a philosopher at uc irvine.

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

a lecture on time machines is here.

some published pieces:

on the inextendibility of spacetime

on gödel and the ideality of time

is the universe as large as it can be?

supertasks (with bryan roberts)

time machines (with john earman and chris wüthrich)

epistemic holes in spacetime

time (hole?) machines

on spacetime singularities, holes, and extensions

geometry of conventionality (with jim weatherall)

global spacetime structure

essay review of david 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?