Question:
Which employer did Phyllis Fox work for in Apr, 1959?

Context:
 Phyllis Fox works for Bell Labs from Jan, 1973 to Jan, 1984. 
 Phyllis Fox works for General Electric from Jan, 1944 to Jan, 1946. 
 Phyllis Fox works for Massachusetts Institute of Technology from Jan, 1958 to Jan, 1963. 
 Phyllis Fox works for New York University from Jan, 1954 to Jan, 1958. 
 Phyllis Fox works for Newark College of Engineering from Jan, 1963 to Jan, 1973.

Answer:
Massachusetts Institute of Technology