Abstract
Recent progress in massive gravity has made it possible to construct consistent theories of interacting spin-2 fields. In this talk I'll describe these developments, focusing on the resolution of the Boulware-Deser ghost problem and the promotion of massive gravity to a bimetric theory of gravity with two dynamical, interacting spin-2 fields. I'll then discuss the generalization of these bimetric theories to theories of multiple interacting spin-2 fields.
