Question:
Which employer did William Thurston work for in Sep, 1972?

Context:
 William Thurston works for University of California, Davis from Jan, 1996 to Jan, 2003. 
 William Thurston works for Massachusetts Institute of Technology from Jan, 1973 to Jan, 1974. 
 William Thurston works for University of California, Berkeley from Jan, 1992 to Jan, 1997. 
 William Thurston works for Institute for Advanced Study from Jan, 1972 to Jan, 1973. 
 William Thurston works for Cornell University from Jan, 2003 to Jan, 2012. 
 William Thurston works for Princeton University from Jan, 1974 to Jan, 1992.

Answer:
Question:
Which employer did William Thurston work for in Sep, 1972?

Context:
 William Thurston works for University of California, Davis from Jan, 1996 to Jan, 2003. 
 William Thurston works for Massachusetts Institute of Technology from Jan, 1973 to Jan, 1974. 
 William Thurston works for University of California, Berkeley from Jan, 1992 to Jan, 1997. 
 William Thurston works for Institute for Advanced Study from Jan, 1972 to Jan, 1973. 
 William Thurston works for Cornell University from Jan, 2003 to Jan, 2012. 
 William Thurston works for Princeton University from Jan, 1974 to Jan, 1992.

Answer:
user
Institute for Advanced Study
assistant
Question:
Which employer did William Thurston work for in Sep, 1972?

Context:
 William Thurston works for University of California, Davis from Jan, 1996 to Jan, 2003. 
 William Thurston works for Massachusetts Institute of Technology from Jan, 1973 to Jan, 1974. 
 William Thurston works for University of California, Berkeley from Jan, 1992 to Jan, 1997. 
 William Thurston works for Institute for Advanced Study from Jan, 1972 to Jan, 1973. 
 William Thurston works for Cornell University from Jan, 2003 to Jan, 2012. 
 William Thurston works for Princeton University from Jan, 1974 to Jan, 1992.

Answer:
user
University of California, Davis
University of California, Berkeley
Massachusetts Institute of Technology
Princeton University
Cornell University
assistant
Question:
Which employer did William Thurston work for in Sep, 1972?

Context:
 William Thurston works for University of California, Davis from Jan, 1996 to Jan, 2003. 
 William Thurston works for Massachusetts Institute of Technology from Jan, 1973 to Jan, 1974. 
 William Thurston works for University of California, Berkeley from Jan, 1992 to Jan, 1997. 
 William Thurston works for Institute for Advanced Study from Jan, 1972 to Jan, 1973. 
 William Thurston works for Cornell University from Jan, 2003 to Jan, 2012. 
 William Thurston works for Princeton University from Jan, 1974 to Jan, 1992.

Answer:
user
Institute for Advanced Study
assistant