Excerpted from wikipedia: Jacques Fabrice Vallée (born September 24, 1939 in Pontoise, Val-d'Oise, France) is a venture capitalist, computer scientist, author, ufologist and former astronomer currently residing in San Francisco, California. In mainstream science, Vallée is notable for co-developing the first computerized mapping of Mars for NASA and for his work at SRI International in creating ARPANET, a precursor to the modern Internet. Vallée is also an important figure in the study of unidentified flying objects (UFOs), first noted for a defense of the scientific legitimacy of the extraterrestrial hypothesis and later for promoting the interdimensional hypothesis.
What makes this important from a sociological perspective is the appendix where it takes a poll of what UFO groups in the mid 60s actually believed in and it turns out that almost nothing has changed in the decades since, in fact that the current obsession with a government cover-up was there from the very beginning
If you haven't read a book by this author, you need to. He takes his vast education about the universe and connects it to what might be. Science fiction meets science fact and intertwine in ways no one expected.