Question:
Which employer did Elliott Waters Montroll work for in Apr, 1968?

Context:
 Elliott Waters Montroll works for Institute for Defense Analyses from Jan, 1963 to Jan, 1966. 
 Elliott Waters Montroll works for University of Rochester from Jan, 1966 to Jan, 1981. 
 Elliott Waters Montroll works for Courant Institute of Mathematical Sciences from Jan, 1950 to Jan, 1951. 
 Elliott Waters Montroll works for University of Maryland from Jan, 1951 to Jan, 1960. 
 Elliott Waters Montroll works for Cornell University from Jan, 1941 to Jan, 1942. 
 Elliott Waters Montroll works for Yale University from Jan, 1940 to Jan, 1941. 
 Elliott Waters Montroll works for Princeton University from Jan, 1942 to Jan, 1943. 
 Elliott Waters Montroll works for IBM from Jan, 1960 to Jan, 1963. 
 Elliott Waters Montroll works for Kellex Corporation from Jan, 1943 to Jan, 1944. 
 Elliott Waters Montroll works for Columbia University from Jan, 1939 to Jan, 1940. 
 Elliott Waters Montroll works for Office of Naval Research from Jan, 1948 to Jan, 1950. 
 Elliott Waters Montroll works for New York University Tandon School of Engineering from Jan, 1944 to Jan, 1946. 
 Elliott Waters Montroll works for Leiden University from Apr, 1967 to Jul, 1968. 
 Elliott Waters Montroll works for University of Pittsburgh from Jan, 1946 to Jan, 1950.

Answer:
Question:
Which employer did Elliott Waters Montroll work for in Apr, 1968?

Context:
 Elliott Waters Montroll works for Institute for Defense Analyses from Jan, 1963 to Jan, 1966. 
 Elliott Waters Montroll works for University of Rochester from Jan, 1966 to Jan, 1981. 
 Elliott Waters Montroll works for Courant Institute of Mathematical Sciences from Jan, 1950 to Jan, 1951. 
 Elliott Waters Montroll works for University of Maryland from Jan, 1951 to Jan, 1960. 
 Elliott Waters Montroll works for Cornell University from Jan, 1941 to Jan, 1942. 
 Elliott Waters Montroll works for Yale University from Jan, 1940 to Jan, 1941. 
 Elliott Waters Montroll works for Princeton University from Jan, 1942 to Jan, 1943. 
 Elliott Waters Montroll works for IBM from Jan, 1960 to Jan, 1963. 
 Elliott Waters Montroll works for Kellex Corporation from Jan, 1943 to Jan, 1944. 
 Elliott Waters Montroll works for Columbia University from Jan, 1939 to Jan, 1940. 
 Elliott Waters Montroll works for Office of Naval Research from Jan, 1948 to Jan, 1950. 
 Elliott Waters Montroll works for New York University Tandon School of Engineering from Jan, 1944 to Jan, 1946. 
 Elliott Waters Montroll works for Leiden University from Apr, 1967 to Jul, 1968. 
 Elliott Waters Montroll works for University of Pittsburgh from Jan, 1946 to Jan, 1950.

Answer:
user
University of Rochester
assistant
Question:
Which employer did Elliott Waters Montroll work for in Apr, 1968?

Context:
 Elliott Waters Montroll works for Institute for Defense Analyses from Jan, 1963 to Jan, 1966. 
 Elliott Waters Montroll works for University of Rochester from Jan, 1966 to Jan, 1981. 
 Elliott Waters Montroll works for Courant Institute of Mathematical Sciences from Jan, 1950 to Jan, 1951. 
 Elliott Waters Montroll works for University of Maryland from Jan, 1951 to Jan, 1960. 
 Elliott Waters Montroll works for Cornell University from Jan, 1941 to Jan, 1942. 
 Elliott Waters Montroll works for Yale University from Jan, 1940 to Jan, 1941. 
 Elliott Waters Montroll works for Princeton University from Jan, 1942 to Jan, 1943. 
 Elliott Waters Montroll works for IBM from Jan, 1960 to Jan, 1963. 
 Elliott Waters Montroll works for Kellex Corporation from Jan, 1943 to Jan, 1944. 
 Elliott Waters Montroll works for Columbia University from Jan, 1939 to Jan, 1940. 
 Elliott Waters Montroll works for Office of Naval Research from Jan, 1948 to Jan, 1950. 
 Elliott Waters Montroll works for New York University Tandon School of Engineering from Jan, 1944 to Jan, 1946. 
 Elliott Waters Montroll works for Leiden University from Apr, 1967 to Jul, 1968. 
 Elliott Waters Montroll works for University of Pittsburgh from Jan, 1946 to Jan, 1950.

Answer:
user
Yale University
Courant Institute of Mathematical Sciences
Kellex Corporation
Institute for Defense Analyses
Princeton University
IBM
Columbia University
University of Pittsburgh
New York University Tandon School of Engineering
University of Maryland
Cornell University
Office of Naval Research
assistant
Question:
Which employer did Elliott Waters Montroll work for in Apr, 1968?

Context:
 Elliott Waters Montroll works for Institute for Defense Analyses from Jan, 1963 to Jan, 1966. 
 Elliott Waters Montroll works for University of Rochester from Jan, 1966 to Jan, 1981. 
 Elliott Waters Montroll works for Courant Institute of Mathematical Sciences from Jan, 1950 to Jan, 1951. 
 Elliott Waters Montroll works for University of Maryland from Jan, 1951 to Jan, 1960. 
 Elliott Waters Montroll works for Cornell University from Jan, 1941 to Jan, 1942. 
 Elliott Waters Montroll works for Yale University from Jan, 1940 to Jan, 1941. 
 Elliott Waters Montroll works for Princeton University from Jan, 1942 to Jan, 1943. 
 Elliott Waters Montroll works for IBM from Jan, 1960 to Jan, 1963. 
 Elliott Waters Montroll works for Kellex Corporation from Jan, 1943 to Jan, 1944. 
 Elliott Waters Montroll works for Columbia University from Jan, 1939 to Jan, 1940. 
 Elliott Waters Montroll works for Office of Naval Research from Jan, 1948 to Jan, 1950. 
 Elliott Waters Montroll works for New York University Tandon School of Engineering from Jan, 1944 to Jan, 1946. 
 Elliott Waters Montroll works for Leiden University from Apr, 1967 to Jul, 1968. 
 Elliott Waters Montroll works for University of Pittsburgh from Jan, 1946 to Jan, 1950.

Answer:
user
University of Rochester
assistant