- Ken Wilber (28), Integral Institute
- Michael Murphy (author), Esalen
- William Irwin Thompson (23), Lindisfarne Association
- Huston Smith
- Stanislav Grof (20)
- Richard Tarnas
- Rupert Sheldrake (11)
- Adi Da, Adidam
- Jorge Ferrer
- Jeffrey Kripal
- Georg Feuerstein
- Lex Hixon*
- Ronald H. Miller
- Michael Washburn
- Andrew Cohen
- Daniel Pinchbeck
- Stuart Davis (musician) (15)
- Frederic Spiegelberg*
- John Heron (6)
- Arjuna Ardagh
- Frank Visser
- David Spangler
- Ralph Abraham
- George Leonard
- Allan Combs
- Ervin László
- Sally Goerner
- Brian Swimme
- Robert McDermott
- M. Alan Kazlev
- Don Beck
- Robert Kegan
- Alex Grey
- Roger Walsh
- Michael E. Zimmerman (philosopher)
- Christopher Bache
- Christian de Quincey