 He served until December 31, 1974, and was succeeded as President of Virginia Tech by William Edward Lavery in 1975.After leaving Virginia Tech, Hahn became an executive with the Georgia-Pacific Corporation.He was with the company starting in 1973 as a director (1973–2016); executive vice president, chemicals (1975); executive vice president, pulp, paper, and chemicals (1975–1976); president (1976–1982); president and chief operating officer (1982–1983); president and chief executive officer (1983–1984); and chairman of the board, president and chief executive officer (1984–1985).