- Temple Grandin
- Ram Dass
- Richard Alpert
- Huston Smith
- Jeffrey Moussaieff Masson
- Confucius
- Peter Hessler
- Konrad Lorenz
- Julia Butterfly Hill
- Phil Lesh
- K.M. Kostyal
- Mickey Hart
- Susan Allport
- Mark Q. Sutton
- Fredric Lieberman
- Steven M. Wise
- Ken Light
- Swami Prakashanand Saraswati
- Allen W. Johnson
- Timothy Earle