Jacques Vallee was actually portrayed fictionally in the movie Close Encounters of the Third Kind.
Over the years Vallee has changed his mind numerous times over what UFOs mighty be. At times he as said aliebn space craft at others he has said they come from other dimensions and at other times from X-File like government deception operations. The man finds massive through, wide ranging, conspiracies to be very congenial. In his books Vallee has admitted to inventing people in his otherwise "non-fiction" "scholarly" studies.