Dennis McKenna is an ethno-pharmacologist who has studied plant hallucinogens for over forty years. In 1975 he co-authored the book Invisible Landscape with his brother Terence McKenna. The book was based on their investigations of Amazonian hallucinogens in 1971. He also acted as co-star of his brother's book True Hallucinations, which further described their experiences while in the Amazon. He earned his Master's degree in botany at the University of Hawaii in 1979, and his Doctorate in Botanical Sciences in 1984 from the University of British Columbia. Since that time, he has conducted extensive ethnobotanical fieldwork in the Peruvian, Colombian, and Brazilian Amazon. In 2001 he joined the faculty of the Center for Spirituality and Healing at the University of Minnesota. He is a founding board member of the Heffter Research Institute, serves on the Advisory Board of the American Botanical Council, and has been a board member for Botanical Dimensions. In 2012, Dennis released The Brotherhood of the Screaming Abyss!, a biography of his life's adventures with Terence.
The Voynich manuscript is an illustrated codex hand-written in an unknown system that dates back to the early 15th century. To this day, no one has succeeded in deciphering the text. Spiritual artist and musician Stuart Davis and Professor of Linguistics