When Dennis asked me to write a foreword for this book, I was surprised and delighted. It had never occurred to me that such a book would require any foreword at all. Dennis is a well-respected researcher and thinker, and many of us have read his scientific papers or listened with pleasure to his interdisciplinary lectures, which combine ethnobotany, psychopharmacology, history, and philosophical reflections. But this is not an academic book. It is the long-awaited account of his lifelong relationship with his older brother Terence, the great raconteur of wide-reaching philosophical and eschatological ideas. In other words, what we have here is the privilege of going behind the curtains and peering into the private lives of these two extraordinary brothers, the poet and the scientist, the public figure and the more retiring originator of ideas, one who haunts us from the invisible yet pervasive World Wide Web (his words still fresh and even more relevant twelve years after his death), the other still with us, wise, and with an acute sense of humor. Like his brother, Dennis is a teacher from whom we still have much to learn. 

Luis Eduardo Luna 

Wasiwaska

Florianópolis, Brazil

August 3, 2012