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 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
Hall, Ansel Franklin. Guide to Yosemite: A handbook of the trails and roads of Yosemite valley and the adjacent region Hall, Ansel Franklin. Guide to Giant Forest, Sequoia National Park: A handbook of the northern section of Sequoia National Park and the adjacent Sierra Nevada Hall, Ansel Franklin, editor. Handbook of Yosemite National Park: a compendium of articles on the Yosemite region by the leading scientific authorities LCCN 21014069. Library of Congress Call No. F 868.Y6 H18. Hall, Ansel Franklin. "Mount Shasta" in Sierra Club Bulletin. 1926. Vol. 12. No. 3. pp. 250–67. Publications of the Sierra Club. Hall, Ansel Franklin. Yosemite Valley: An intimate guide Hall, Ansel Franklin. A Guide to Sequoia and General GrantNational Parks Hall, Ansel Franklin. General report on the Rainbow Bridge-Monument Valley Expedition of 1933 Hall, Ansel Franklin. A pictorial guide to Mesa Verde National Park Hall, Ansel Franklin. Mesa Verde, a brief guide Turner, Jack, author, and Hall, Ansel F, photographer. Early Images of the Southwest: The Lantern Slides of Ansel F. Hall. Turner, Jack, author, and Hall, Ansel F, photographer. Landscapes On Glass: Lantern Slides For The Rainbow Bridge - Monument Valley Expedition With a foreword by President Bill Clinton.. 978-1-887805-31-5