The work of the Topology group is focused on stable homotopy theory, and equivariant versions for spectra with action of a compact Lie group. One major theme is elliptic cohomology, which has rich connections with the work of the Number Theory group. Another theme involves the commutative algebra of generalised cohomology rings, particularly in an equivariant context, which again interacts strongly with the Algebra group.

A third body of work involves the categorical foundations of homotopy theory, in terms of model categories and their derived categories (which are often triangulated). The group has worked extensively on highly structured ring spectra and their modules, which also fall under this heading.