"'A good read for anybody interested in psychedelics, or altered or expanded (multi) states of Consciousness. ... I want to do Tom's classes!"

"He proposes essential and radical reformulations of ideas in medicine, psychology, and education. ... My world is richer, more open, and more inviting now."

"Psychedelic Horizons will hopefully lead the way towards an enlightened view of psychedelics and their responsible use, in the West and throughout the world."

"An outstanding study of the human mind and what may actually be beneficially derived from the use of psychedelic experiences for the human mind, body, and overall cognitive processes."

"His chapter on 'Snow White-Grof's Landmarks in Disney's Land' is a whimsical, psychedelic interpretation of Snow White that will change the way you read this fairy tale."

"Walsh and Roberts are surely right to argue that no psychology or science that ignores psychedelics can be complete."

"In part three, 'Multistate Mind', the book goes from being interesting to mind boggling."

"Roberts's ideas are described in a refreshing and remarkably personal way. ... a fascinating examination of the possibilities for the human mind."

"Psychedelic Horizons makes for fascinating reading ... very thought-provoking, informative and entertaining."

"The initial effect ... is puzzling, a state where i felt something deeper existed within the fragments being layed out ... and then there is an 'a ha!' moment where the pieces click in to place. From then on the book unfolds aspect after aspect of original thought, leading to a brighter future view - an affirming trip."

"Psychedelic Horizons fits nicely into the border between more mainstream and transpersonal psychology . . . a good introductory overview of some important topics in transpersonal psychology."