I first took mescaline in 1961 and have experienced almost all of the important psychedelic plants and compounds. I may be one of the few persons still living who knew well all of the key psychedelic pioneers: Dick Schultes, Alpert and Leary, Gordon Wasson, Albert Hofmann, Sasha Shulgin, and many more. I will summarize what I have learned from psychedelics and how that has shaped my philosophy of Integrative Medicine and led to my belief that psychedelics are our best hope for saving our world.