Question:
Which employer did William Claytor work for in Dec, 1937?

Context:
 William Claytor works for West Virginia State University from Jan, 1933 to Jan, 1936. 
 William Claytor works for Southern University from Jan, 1945 to Jan, 1946. 
 William Claytor works for Hampton University from Jan, 1946 to Jan, 1947. 
 William Claytor works for United States Army from Jan, 1941 to Jan, 1945. 
 William Claytor works for Howard University from Jan, 1947 to Jan, 1967. 
 William Claytor works for University of Michigan from Jan, 1936 to Jan, 1941.

Answer:
University of Michigan