Question:
Which employer did Robert Langlands work for in Nov, 1997?

Context:
 Robert Langlands works for Institute for Advanced Study from Jan, 1972 to Jan, 2007. 
 Robert Langlands works for Yale University from Jan, 1967 to Jan, 1972. 
 Robert Langlands works for Princeton University from Jan, 1960 to Jan, 1967.

Answer:
Question:
Which employer did Robert Langlands work for in Nov, 1997?

Context:
 Robert Langlands works for Institute for Advanced Study from Jan, 1972 to Jan, 2007. 
 Robert Langlands works for Yale University from Jan, 1967 to Jan, 1972. 
 Robert Langlands works for Princeton University from Jan, 1960 to Jan, 1967.

Answer:
user
Institute for Advanced Study
assistant
Question:
Which employer did Robert Langlands work for in Nov, 1997?

Context:
 Robert Langlands works for Institute for Advanced Study from Jan, 1972 to Jan, 2007. 
 Robert Langlands works for Yale University from Jan, 1967 to Jan, 1972. 
 Robert Langlands works for Princeton University from Jan, 1960 to Jan, 1967.

Answer:
user
Princeton University
Yale University
assistant
Question:
Which employer did Robert Langlands work for in Nov, 1997?

Context:
 Robert Langlands works for Institute for Advanced Study from Jan, 1972 to Jan, 2007. 
 Robert Langlands works for Yale University from Jan, 1967 to Jan, 1972. 
 Robert Langlands works for Princeton University from Jan, 1960 to Jan, 1967.

Answer:
user
Institute for Advanced Study
assistant