Question:
Which employer did Lawrence Heaney work for in Jul, 1986?

Context:
 Lawrence Heaney works for Smithsonian Institution from Jan, 1986 to Jan, 1988. 
 Lawrence Heaney works for Delaware Museum of Natural History from Jan, 1971 to Jan, 1971. 
 Lawrence Heaney works for Field Museum of Natural History from Jan, 1988 to Jan, 1988. 
 Lawrence Heaney works for University of Minnesota from Jan, 1972 to Jan, 1975. 
 Lawrence Heaney works for University of Kansas from Jan, 1975 to Jan, 1979. 
 Lawrence Heaney works for University of Michigan from Jan, 1979 to Jan, 1986.

Answer:
Smithsonian Institution