October 1921 — An Appalachian Trail: A Project in Regional Planning (PDF) by Benton MacKaye appears in the Journal of the American Institute of Architects.

April 1922 — Appalachian Trail Committee of Washington formed.

March 3, 1925 — Appalachian Trail Conference established.

January 1927 — Judge Arthur Perkins becomes acting ATC chairman, stimulates additional field work.

June 1931 — Myron H. Avery elected to first of seven consecutive terms as ATC chairman.

August 14, 1937 — Appalachian Trail completed as a continuous footpath.

October 2, 1968 — National Trails System Act becomes law; A.T. becomes a national scenic trail under federal protection.

August 1972 — ATC headquarters moved from Washington, D.C., to Harpers Ferry, W.Va.

March 21, 1978 — "Appalachian Trail Amendments" to National Trails System Act signed into law.

January 26, 1984 — National Park Service delegates to ATC the responsibility for managing A.T. corridor lands.

November 20, 2004 — The Board of Managers of the Appalachian Trail Conference overwhelmingly votes to change the organization's name to Appalachian Trail Conservancy to better reflect its mission of preserving the trail experience for generations to come.

July 4, 2005 — The Appalachian Trail Conference becomes the Appalachian Trail Conservancy, celebrating 80 years of caring for the Appalachian Trail.