Question:
Which employer did William McCrea work for in Dec, 1942?

Context:
 William McCrea works for University of Sussex from Jan, 1966 to Jan, 1972. 
 William McCrea works for Imperial College London from Jan, 1932 to Jan, 1936. 
 William McCrea works for Royal Holloway, University of London from Jan, 1946 to Jan, 1966. 
 William McCrea works for University of Edinburgh from Jan, 1929 to Jan, 1932. 
 William McCrea works for Queen's University Belfast from Jan, 1936 to Jan, 1943.

Answer:
Queen's University Belfast