Question:
Which employer did Rudolf Haag work for in Jan, 1976?

Context:
 Rudolf Haag works for University of Hamburg from Jan, 1966 to Jan, 1987. 
 Rudolf Haag works for CERN from Jan, 1953 to Jan, 1954. 
 Rudolf Haag works for Ludwig Maximilian University of Munich from Jan, 1951 to Jan, 1956. 
 Rudolf Haag works for Max Planck Institute for Physics from Jan, 1956 to Jan, 1957. 
 Rudolf Haag works for University of Illinois at Urbana–Champaign from Jan, 1960 to Jan, 1966. 
 Rudolf Haag works for Aix-Marseille University from Jan, 1959 to Jan, 1960. 
 Rudolf Haag works for Princeton University from Jan, 1957 to Jan, 1959.

Answer:
University of Hamburg