Question:
Which employer did Martin Ostwald work for in Dec, 1991?

Context:
 Martin Ostwald works for Wesleyan University from Jan, 1950 to Jan, 1951. 
 Martin Ostwald works for Columbia University from Jan, 1951 to Jan, 1958. 
 Martin Ostwald works for Swarthmore College from Jan, 1958 to Jan, 1992. 
 Martin Ostwald works for University of Pennsylvania from Jan, 1968 to Jan, 1992.

Answer:
Question:
Which employer did Martin Ostwald work for in Dec, 1991?

Context:
 Martin Ostwald works for Wesleyan University from Jan, 1950 to Jan, 1951. 
 Martin Ostwald works for Columbia University from Jan, 1951 to Jan, 1958. 
 Martin Ostwald works for Swarthmore College from Jan, 1958 to Jan, 1992. 
 Martin Ostwald works for University of Pennsylvania from Jan, 1968 to Jan, 1992.

Answer:
user
University of Pennsylvania
assistant
Question:
Which employer did Martin Ostwald work for in Dec, 1991?

Context:
 Martin Ostwald works for Wesleyan University from Jan, 1950 to Jan, 1951. 
 Martin Ostwald works for Columbia University from Jan, 1951 to Jan, 1958. 
 Martin Ostwald works for Swarthmore College from Jan, 1958 to Jan, 1992. 
 Martin Ostwald works for University of Pennsylvania from Jan, 1968 to Jan, 1992.

Answer:
user
Wesleyan University
Columbia University
assistant
Question:
Which employer did Martin Ostwald work for in Dec, 1991?

Context:
 Martin Ostwald works for Wesleyan University from Jan, 1950 to Jan, 1951. 
 Martin Ostwald works for Columbia University from Jan, 1951 to Jan, 1958. 
 Martin Ostwald works for Swarthmore College from Jan, 1958 to Jan, 1992. 
 Martin Ostwald works for University of Pennsylvania from Jan, 1968 to Jan, 1992.

Answer:
user
University of Pennsylvania
assistant