Question:
Which employer did Frederick M. Bernthal work for in Jan, 1964?

Context:
 Frederick M. Bernthal works for Argonne National Laboratory from Jan, 1964 to Jan, 1964. 
 Frederick M. Bernthal works for National Science Foundation from Jan, 1990 to Jan, 1994. 
 Frederick M. Bernthal works for Michigan State University from Jan, 1970 to Jan, 1978. 
 Frederick M. Bernthal works for Universities Research Association from Jan, 1994 to Jan, 1994. 
 Frederick M. Bernthal works for Howard Baker from Jan, 1978 to Jan, 1983. 
 Frederick M. Bernthal works for Nuclear Regulatory Commission from Jan, 1983 to Jan, 1985.

Answer:
Argonne National Laboratory