Daniel Goleman

Ken Wilber

Charles Tart

Roger Walsh

Jack Kornfield

Roger Walsh

Jack Kornfield

Judith Malamud

Steven Laberge

Jane Gackenbach and Jane Bosveld

Sri Aurobindo

Steven Laberge

Houston Smith

William James

Stanislav Grof

Ken Wilber

John L. Engler

Mark Epstein

Ken Wilber

Kristina Grof and Stanislav Grof

Kristina Grof and Stanislav Grof

J. Feuerstein

Ken Wilber

Ken Wilber

Francis Vaughan

Brian Whittine

Michael Murphy

Gordon Globus

Ken Wilber

Fritjof Capra

Charles D. Laughlin, John McManus, John Shearer

Kenneth Ring< /p>

Robert D. McDermott

Aldous Huxley

Ken Wilber

Roger Walsh

Dalai Lama

Ram Dass

John Wellwood

Warwick Fox

Bill Devall and George Sessions

Dwayne Elgin

Peter Russell

Ken Wilber

Roger Walsh and Frances Vaughan