Question:
Which employer did Alfred H. Clifford work for in Aug, 1933?

Context:
 Alfred H. Clifford works for Institute for Advanced Study from Jan, 1933 to Jan, 1938. 
 Alfred H. Clifford works for Tulane University from Jan, 1955 to Jan, 1982. 
 Alfred H. Clifford works for Johns Hopkins University from Jan, 1952 to Jan, 1955. 
 Alfred H. Clifford works for United States Army from Jan, 1950 to Jan, 1952. 
 Alfred H. Clifford works for Massachusetts Institute of Technology from Jan, 1938 to Jan, 1942.

Answer:
Institute for Advanced Study