Question:
Which employer did Harold Hotelling work for in Aug, 1936?

Context:
 Harold Hotelling works for Columbia University from Jan, 1931 to Jan, 1946. 
 Harold Hotelling works for Puyallup Herald from Jan, 1915 to Jan, 1916. 
 Harold Hotelling works for Stanford University from Jan, 1924 to Jan, 1931. 
 Harold Hotelling works for University of North Carolina at Chapel Hill from Jan, 1946 to Jan, 1966. 
 Harold Hotelling works for The Washington Standard from Jan, 1919 to Jan, 1920.

Answer:
Columbia University