The Human Experience · Episode
Episode 29 – Dennis Mckenna Ph.D.
A conversation with Dennis Mckenna Ph.D.
Dennis Mckenna P.hD. has been doing research in the field of ethnopharmacology for over 30 years. He is a researcher, scientist, author, lecturer and founding board member of ethnopharmacology at the Hefter…

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Episode field notes
Show notes
Dennis Mckenna P.hD. has been doing research in the field of ethnopharmacology for over 30 years. He is a researcher, scientist, author, lecturer and founding board member of ethnopharmacology at the Hefter Research Institute.

Dr. McKenna received his Master’s degree in botany at the University of Hawaii in 1979. He received his doctorate in botanical sciences in 1984 from the University of British Columbia, where he wrote his dissertation entitled: “Monoamine oxidase inhibitors in Amazonian hallucinogenic plants: ethnobotanical, phytochemical, and pharmacological investigations”.
Dr. McKenna then received post-doctoral research fellowships in the Laboratory of Clinical Pharmacology, National Institute of Mental Health, and in the Department of Neurology, Stanford University School of Medicine.
Dennis and his brother, Terrence Mckenna, through their work, research, science and exploration have forever changed the way we view plant medicine for society and the world.
Dr. McKenna’s memoir, The Brotherhood of the Screaming Abyss about his and his brother Terence’s life and journeys together, was published in 2012. A compelling account of the Mckenna Brothers, their lives their journeys and their adventures.

Click this image to purchase the book
In this episode, we dive through Dr. Mckenna’s perspective; sharing the story of his life and his thoughts of some of the things regarding his brother Terrence Mckenna’s work. We discuss the nature of reality, psychedelic experiences and how these medicines are transforming and shaping plant medicine as we know it.
Find Dennis Mckenna & buy his book here:www.brotherhoodofthescreamingabyss.com
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Transcript
A full transcript has been published for this conversation.
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Quotes
Five substantial excerpts from the published transcript, lightly edited for clarity without changing their meaning.
“Predicting the end of the world is difficult because there is no prior example to study, and a dated prediction is almost certain to disappoint. Apocalyptic theories may still express a valid intuition that an era or way of thinking is ending, but symbolic transition should not be confused with a literal calendar deadline.”
From the conversation“When evidence is insufficient, ‘we do not know’ is not a failure or a scientific escape hatch. Suspending judgment is the essence of the scientific stance. It preserves multiple possibilities until better data can distinguish among them, rather than filling uncertainty with whichever explanation is most emotionally satisfying.”
From the conversation“The brain transforms raw sensory information into a coherent world. Physics describes fields, energy, vibration, and quantum states that look nothing like ordinary experience, yet perception gives us stable objects and usable space. Even under psychedelics, experience usually retains some organization because the brain continues constructing a reality we can inhabit.”
From the conversation“Calling an altered state a hallucination does not make it valueless. Phenomenology begins by taking experience seriously as experience, without first deciding what exists behind it. A shaman’s vision may not prove an external spirit world, but it remains a real event in consciousness with psychological, cultural, and sometimes practical consequences.”
From the conversation“Western culture often discounts inner experience unless it produces an external application. Clinical research is changing that by studying psychedelics for PTSD, addiction, and end-of-life anxiety. Medical usefulness can open institutional doors, but the value of an experience should not be reduced entirely to whether it qualifies as a treatment.”
From the conversation
About the guest
Dennis Mckenna Ph.D.
Dennis Mckenna P.hD. has been doing research in the field of ethnopharmacology for over 30 years. He is a researcher, scientist, author, lecturer and founding board member of ethnopharmacology at the Hefter Research Institute.
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