Question:
Which employer did Tjalling Koopmans work for in Jul, 1966?

Context:
 Tjalling Koopmans works for Netherlands School of Economics from Jan, 1936 to Jan, 1938. 
 Tjalling Koopmans works for British Merchant Shipping Industry Joint Working Party from Jan, 1942 to Jan, 1944. 
 Tjalling Koopmans works for Penn Mutual from Jan, 1941 to Jan, 1942. 
 Tjalling Koopmans works for League of Nations from Jan, 1938 to Jan, 1940. 
 Tjalling Koopmans works for Yale University from Jan, 1955 to Jan, 1980. 
 Tjalling Koopmans works for University of Chicago from Jan, 1944 to Jan, 1955. 
 Tjalling Koopmans works for Princeton University from Jan, 1940 to Jan, 1941.

Answer:
Question:
Which employer did Tjalling Koopmans work for in Jul, 1966?

Context:
 Tjalling Koopmans works for Netherlands School of Economics from Jan, 1936 to Jan, 1938. 
 Tjalling Koopmans works for British Merchant Shipping Industry Joint Working Party from Jan, 1942 to Jan, 1944. 
 Tjalling Koopmans works for Penn Mutual from Jan, 1941 to Jan, 1942. 
 Tjalling Koopmans works for League of Nations from Jan, 1938 to Jan, 1940. 
 Tjalling Koopmans works for Yale University from Jan, 1955 to Jan, 1980. 
 Tjalling Koopmans works for University of Chicago from Jan, 1944 to Jan, 1955. 
 Tjalling Koopmans works for Princeton University from Jan, 1940 to Jan, 1941.

Answer:
user
Yale University
assistant
Question:
Which employer did Tjalling Koopmans work for in Jul, 1966?

Context:
 Tjalling Koopmans works for Netherlands School of Economics from Jan, 1936 to Jan, 1938. 
 Tjalling Koopmans works for British Merchant Shipping Industry Joint Working Party from Jan, 1942 to Jan, 1944. 
 Tjalling Koopmans works for Penn Mutual from Jan, 1941 to Jan, 1942. 
 Tjalling Koopmans works for League of Nations from Jan, 1938 to Jan, 1940. 
 Tjalling Koopmans works for Yale University from Jan, 1955 to Jan, 1980. 
 Tjalling Koopmans works for University of Chicago from Jan, 1944 to Jan, 1955. 
 Tjalling Koopmans works for Princeton University from Jan, 1940 to Jan, 1941.

Answer:
user
Netherlands School of Economics
University of Chicago
British Merchant Shipping Industry Joint Working Party
Princeton University
Penn Mutual
League of Nations
assistant
Question:
Which employer did Tjalling Koopmans work for in Jul, 1966?

Context:
 Tjalling Koopmans works for Netherlands School of Economics from Jan, 1936 to Jan, 1938. 
 Tjalling Koopmans works for British Merchant Shipping Industry Joint Working Party from Jan, 1942 to Jan, 1944. 
 Tjalling Koopmans works for Penn Mutual from Jan, 1941 to Jan, 1942. 
 Tjalling Koopmans works for League of Nations from Jan, 1938 to Jan, 1940. 
 Tjalling Koopmans works for Yale University from Jan, 1955 to Jan, 1980. 
 Tjalling Koopmans works for University of Chicago from Jan, 1944 to Jan, 1955. 
 Tjalling Koopmans works for Princeton University from Jan, 1940 to Jan, 1941.

Answer:
user
Yale University
assistant