Question:
Which employer did Paul Arthur Schilpp work for in Nov, 1957?

Context:
 Paul Arthur Schilpp works for University of the Pacific from Jan, 1923 to Jan, 1936. 
 Paul Arthur Schilpp works for Southern Illinois University Carbondale from Jan, 1965 to Jan, 1980. 
 Paul Arthur Schilpp works for Northwestern University from Jan, 1936 to Jan, 1965.

Answer:
Northwestern University