Rick Doblin, Grey, Charles S. Grob, Grof, M. D., John Halpern, Kat Harrison, Francis G. Lu, M. D. John Markoff, Barbara Marx Hubbard, Terence McKenna, Ralph Metzner, Michael Mithoefer, Narby, Ph. D Daniel Pinchbeck, Dr. Marilyn Schlitz, Brother David SteindlRast, Rick Tarnas, Charles T. Tart, Ulansey, Ph. D