Hall's energy and competence attracted attention in Washington and he was promoted to serve in the following posts: • 1923–1930: Chief Naturalist of the National Park Service. • 1923–1933: Chief Forester and Senior Naturalist of the National Park Service. • 1933–1937: Chief of the National Park Service Field Division. In 1930, Hall co-wrote (with
Frederick Law Olmsted's sons) a report for an
Oakland, California, foundation which "...advocated a revolutionary new concept: a regional approach to park development, the creation of truly large, interconnected parklands that would define an urban landscape...", and which led directly to the establishment of the
East Bay Regional Park District in the Oakland area In 1933–1934, Hall led an expedition to the
Rainbow Bridge -
Monument Valley area, which produced thousands of valuable photographs of Indian life in the
Four Corners area of that time. Hall left the Park Service in 1938 to operate concessions in
Mesa Verde National Park. Later he worked as a consultant in park design and interpretation and wrote books on the topic. ==Publications==