 He joined the F. W. Woolworth board in 1926 and was chairman from 1943 until reaching the mandatory retirement age forty-five years later in 1971.He became Chairman of The University at Buffalo's governing Council from 1950-69.Knox served on the board of directors of Marine Midland Bank, F. W. Woolworth Company, New York Central Railroad, Penn Central Railroad, and the American Steamship Company.