His research continued to be of fundamental importance in the homotopy theory of classifying spaces of topological groups, finite H-spaces and equivariant homotopy theory.
Ang kanyang mga pananaliksik na patuloy na maging ng mga pangunahing kahalagahan sa homotopy teorya ng classifying agwat ng topological grupo ng, wakas H-espasyo at equivariant homotopy theory.