Question:
Which employer did Joan Leitzel work for in Jun, 1990?

Context:
 Joan Leitzel works for University of New Hampshire from Jan, 1996 to Jan, 2002. 
 Joan Leitzel works for University of Nebraska–Lincoln from Jan, 1992 to Jan, 1996. 
 Joan Leitzel works for Ohio State University from Jan, 1965 to Jan, 1990. 
 Joan Leitzel works for National Science Foundation from Jan, 1990 to Jan, 1992.

Answer:
Question:
Which employer did Joan Leitzel work for in Jun, 1990?

Context:
 Joan Leitzel works for University of New Hampshire from Jan, 1996 to Jan, 2002. 
 Joan Leitzel works for University of Nebraska–Lincoln from Jan, 1992 to Jan, 1996. 
 Joan Leitzel works for Ohio State University from Jan, 1965 to Jan, 1990. 
 Joan Leitzel works for National Science Foundation from Jan, 1990 to Jan, 1992.

Answer:
user
National Science Foundation
assistant
Question:
Which employer did Joan Leitzel work for in Jun, 1990?

Context:
 Joan Leitzel works for University of New Hampshire from Jan, 1996 to Jan, 2002. 
 Joan Leitzel works for University of Nebraska–Lincoln from Jan, 1992 to Jan, 1996. 
 Joan Leitzel works for Ohio State University from Jan, 1965 to Jan, 1990. 
 Joan Leitzel works for National Science Foundation from Jan, 1990 to Jan, 1992.

Answer:
user
University of New Hampshire
University of Nebraska–Lincoln
Ohio State University
assistant
Question:
Which employer did Joan Leitzel work for in Jun, 1990?

Context:
 Joan Leitzel works for University of New Hampshire from Jan, 1996 to Jan, 2002. 
 Joan Leitzel works for University of Nebraska–Lincoln from Jan, 1992 to Jan, 1996. 
 Joan Leitzel works for Ohio State University from Jan, 1965 to Jan, 1990. 
 Joan Leitzel works for National Science Foundation from Jan, 1990 to Jan, 1992.

Answer:
user
National Science Foundation
assistant