Question:
Where was Gustave Choquet educated in May, 1938?

Context:
 Gustave Choquet attended École normale supérieure  (Paris) from Jan, 1934 to Jan, 1937. 
 Gustave Choquet attended Princeton University from Jan, 1938 to Jan, 1939. 
 Gustave Choquet attended Lycée Saint-Louis from Jan, 1933 to Jan, 1934.

Answer:
Princeton University