- Robert Bauval
- Adrian Geoffrey Gilbert
- Jacques F. Vallée
- David Hatcher Childress
- Andrew Collins
- Lewis Spence
- Kenneth Ring
- Daniel Pinchbeck
- Tim Wallace-Murphy
- Richard C. Hoagland
- Rand Flem-Ath
- Nick Redfern
- Peter Lemesurier
- William L. Moore
- Rick Strassman
- Robert M. Schoch
- Donald R. Schmitt
- Joseph P. Farrell
- Chris Ogilvie-Herald
- Santha Faiia