Question:
Which position did Pierre Renouvin hold in Apr, 1938?

Context:
 Pierre Renouvin holds the position of dean from Jan, 1955 to Jan, 1958. 
 Pierre Renouvin holds the position of director from Jan, 1935 to Jan, 1939. 
 Pierre Renouvin holds the position of president from Jan, 1965 to Jan, 1965. 
 Pierre Renouvin holds the position of president from Jan, 1959 to Jan, 1971.

Answer:
director