Rudolf Hess
Picknett and Prince perform most of the research for their books themselves, though they are sometimes helped by several friends and fellow researchers. They have credited Keith Prince as a main contributor for their work on the Turin Shroud, Philip Coppens in "The Stargate Conspiracy" (published in 1999), and Robert Brydon for their work on "Rudolf Hess" (titled "Double Standards: The Rudolf Hess Cover-Up" and published in 2001).