MacKaye, Benton, 1879-1975, American forester and regional planner, b. Stamford, Conn., grad. Harvard (B.A., 1900; M.A. School of Forestry, 1905); son of Steele MacKaye. He was a research forester of the U.S. Forest Service; he planned and helped in the construction of the Appalachian Trail (1921) and served on the regional planning staff of the Tennessee Valley Authority (1934-36) and on the staff of the Rural Electrification Administration (1942-45). MacKaye's philosophy of regional planning is given in The New Exploration (1928).