 He served as director for the board of control of Southern Regional Education Board; First National-Exchange Bank of Virginia; The Lane Company; Dominion Bankshares, Inc.; Roanoke Electric Steel Corporation, and Shenandoah Life Insurance Company.Hahn has been a member of several additional boards and commissions, including the Virginia State Board of Agriculture and Commerce (member, 1962–1974); Governor of Virginia's Commission on the Status of Women (member, 1964-1966); Metropolitan Areas Study Commission of Virginia (chairman, 1966–1968); Virginia Cancer Crusade (chairman, 1972); Salvation Army National Capitol and Virginia Divisional Advisory Board (chairman, 1972–1974); and Academic Affairs Commission, American Council of Education (member).After retiring from Georgia-Pacific in 1993, Hahn returned to Montgomery County, Virginia, where he lived on his farm in the Ellett Valley and raised cattle, sheep, and goats.