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David Deida is an American author, independent researcher, and teacher. He writes on spiritual practice, nondual sexuality, and sociocultural evolution.

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He has published ten books in more than 25 languages. Deida's early scientific research includes psychobiology, human evolutionary psychology, neuroscience, and mathematical modeling of the immune and nervous systems. Since 1975 he has trained in hatha yoga, tai chi chuan, various forms of meditation, and sexual yoga.

For over two decades, Deida has been writing books on spiritual-sexual growth, practicing in solitary retreat, and traveling internationally to present his work to a wide range of audiences

David Deida was born David Greenberg in Cleveland, Ohio on March 18, 1958.

His name was later legally changed to his childhood nickname, Deida, which his family called him since birth. After writing several privately distributed books, receiving the 1974 National Writing Award, as well