  Although cosmologists came from Europe and America as well as Britain, most of the work in theoretical cosmology took place in London, Cambridge and Oxford. Americans Hubble, Tolman and Robertson did their work at CalTech in Pasadena, but were frequently in England; and most of the European and British workers cycled through Pasadena at one time or another. De Sitter, from Holland, and LeMaître, from Belgium, spent important periods in England, as did various of the German workers. Thus, even though cosmology was done throughout the Western world, its major concentrating point was England; our focus in what follows will be the same.