Question:
Which employer did I. J. Good work for in Sep, 1969?

Context:
 I. J. Good works for Institute for Defense Analyses from Jan, 1962 to Jan, 1964. 
 I. J. Good works for Trinity College from Jan, 1964 to Jan, 1967. 
 I. J. Good works for University of Manchester from Jan, 1945 to Jan, 1948. 
 I. J. Good works for Admiralty Research Laboratory from Jan, 1959 to Jan, 1962. 
 I. J. Good works for Government Communications Headquarters from Jan, 1948 to Jan, 1959. 
 I. J. Good works for Virginia Tech from Jan, 1967 to Jan, 1994.

Answer:
Virginia Tech