Gabor Maté

Julie Holland

Rick Doblin

Ralph Metzner

Charles Grob

David Healy

David E. Nichols

David Nutt

Dennis J. McKenna

Gillian Maxwell

Ingrid Pacey

Jeremy Narby

Kathleen Harrison

Manuel Schoch

Michael James Winkelman

Michael Mithoefer

Roland Griffiths

Stanislav Grof

Stephen Ross

Wade Davis

William Richards

Amanda Feilding

Chris Bennett