Question:
Which employer did Tony Heinz work for in May, 1987?

Context:
 Tony Heinz works for IBM Thomas J. Watson Research Center from Jan, 1983 to Jan, 1995. 
 Tony Heinz works for Columbia University from Jan, 1995 to Jan, 2014. 
 Tony Heinz works for Stanford University from Jan, 2015 to Dec, 2022.

Answer:
Question:
Which employer did Tony Heinz work for in May, 1987?

Context:
 Tony Heinz works for IBM Thomas J. Watson Research Center from Jan, 1983 to Jan, 1995. 
 Tony Heinz works for Columbia University from Jan, 1995 to Jan, 2014. 
 Tony Heinz works for Stanford University from Jan, 2015 to Dec, 2022.

Answer:
user
IBM Thomas J. Watson Research Center
assistant
Question:
Which employer did Tony Heinz work for in May, 1987?

Context:
 Tony Heinz works for IBM Thomas J. Watson Research Center from Jan, 1983 to Jan, 1995. 
 Tony Heinz works for Columbia University from Jan, 1995 to Jan, 2014. 
 Tony Heinz works for Stanford University from Jan, 2015 to Dec, 2022.

Answer:
user
Columbia University
Stanford University
assistant
Question:
Which employer did Tony Heinz work for in May, 1987?

Context:
 Tony Heinz works for IBM Thomas J. Watson Research Center from Jan, 1983 to Jan, 1995. 
 Tony Heinz works for Columbia University from Jan, 1995 to Jan, 2014. 
 Tony Heinz works for Stanford University from Jan, 2015 to Dec, 2022.

Answer:
user
IBM Thomas J. Watson Research Center
assistant