- Alberto Villoldo
- Lawrence LeShan
- Tim Freke
- Ted Kaptchuk
- Jacques F. Vallée
- Mimi Spencer
- Peter Gandy
- Michael Mosley
- Gary T. Moran
- Jack Angelo
- Ronald Hutton
- Holger Kalweit
- Peter S. Wells
- Joyce Higginbotham
- River Higginbotham
- David W. Sollars
- Carl A.P. Ruck
- R. Gordon Wasson
- Jonathan Ott
- Cyprian Consiglio