University of California Riverside. Research interests: quantum gravity and n-categories. Regular column on "This Week's Finds in Mathematical Physics".
Senior research scientist with the Australian Public Service (APS) and on the executive committee of the Australian Institute of Physics (AIP). His research interests are general relativity and cosmology.
Rutgers University. Research on string theory and M-theory, with a particular emphasis on the underlying mathematical structures and applications to and from modern mathematics.