I work on a lot of different topics, including these the limits of what is possible, the structure of space and time, parts and wholes, things and their properties, evidence, belief, knowledge, and action.

I am currently working on issues in decision theory and ethics involving large and infinite numbers.

Most of my work applies technical tools to traditional philosophical questions.


  • Possible Patterns (with John Hawthorne)
    Oxford Studies in Metaphysics 2018
  • How Much is at Stake for the Pragmatic Encroacher
    Oxford Studies in Epistemology 2018
  • The Logic of Opacity (with Andrew Bacon)
    Philosophy and Phenomenological Review 2017
  • Composition as Abstraction
    Journal of Philosophy 2017
  • Quality and Quantifiers
    Australasian Journal of Philosophy 2017
  • General Dynamic Triviality Theorems (with John Hawthorne)
    Philosophical Review 2016
  • Qualitative Grounds
    Philosophical Perspectives 2016
  • Temporary Safety Hazards
    Noûs 2015
  • Indefinite Divisibility
    Inquiry 2015
  • Groupthink (with John Hawthorne and Lara Buchak)
    Philosophical Studies 2015
  • On Where Things Could Be
    Philosophy of Science 2014
  • Possible Worlds and the Objective World
    Philosophy and Phenomenological Research 2013
  • Actuality for Counterpart Theorists
    Mind 2013
  • The Structure of Gunk: Adventures in the Ontology of Space
    Oxford Studies in Metaphysics 2008
Photo by Ken Lund [CC BY-SA 2.0]


I regularly teach Philosophy 450 (The Limits of Logic), which is about the limits of what can be said, proven, calculated, or counted. We study deep human discoveries about the infinite, the indescribable, and the impossible. If you've taken intro logic (or suitable courses in math, computer science, or linguistics) and you're interested in taking 450, contact me.

I've been working on a new textbook for this class. Here's a draft.

I also regularly teach graduate seminars and undergraduate classes in metaphysics, epistemology, philosophy of religion, philosophy of language, and philosophy of math.

Spring 2019

Past Courses

By Tuxyso (Own work) [CC BY-SA 3.0 (], via Wikimedia Commons

Contact Me

University of Southern California, School of Philosophy

Office Hours (Spring 2019)

Tuesday 11am–12pm and Thursday 8:30–9:15am
227 Stonier Hall