By the time he retired from Queen Square in 1949 the advent of the National Health Service had seen the establishment of neurosurgical centres throughout the country, many with neuropathologists already in post. In 1950 with a group of senior colleagues Greenfield started the Neuropathological Club, with 28 founder members.
By 1949, when he left Queen Square, the National Health Service had established neurosurgical facilities across the country, and many already housed neuropathologists. In 1950, Greenfield initiated the Neuropathological Club with a group of senior colleagues, including 28 founding members.