Question:
Which employer did John Pople work for in Jun, 2003?

Context:
 John Pople works for National Physical Laboratory from Jan, 1958 to Jan, 1961. 
 John Pople works for Carnegie Mellon University from Jan, 1964 to Jan, 1993. 
 John Pople works for Northwestern University from Jan, 1993 to Jan, 2004. 
 John Pople works for University of Cambridge from Jan, 1954 to Jan, 1958.

Answer:
Northwestern University