From the New York Times, March 19, 1992
Professor [Deane] Montgomery, the mentor of a generation of young mathematicians, focused on topology, a comparatively recent branch of mathematics. It analyzes the intrinsic features of objects, often while twisting and deforming the space they occupy. . . . A result of this work drew attention in 1952 when he and two fellow American mathematicians, Andrew Gleason and Leo Zippin, solved a poser regarding locally Euclidean topological groups known as Hilbert's Fifth Problem.