An interesting article Texas oilman Tom Slick by author Lauren Coleman. Coleman has guested numerous times on various radio and TV programs and largely investigates cryptozoology.
Tom Slick was one of those guys that knew many of the players in the JFK saga. He either knew or was known by, Prescott Bush, George de Mohrenschildt and Allen Dulles. Died 14 months before JFK when his plane exploded mid-air. As stated in the piece by Loren Coleman, "Tom Slick and his family worked closely with the OSS and the CIA for years, anywhere there was oil, air freight to ship, or adventures to serve as covers (like hunting for Yetis in Nepal/Tibet)."