Bill Richards is a psychedelic researcher with a special interest in the religious and spiritual experiences occasioned by psychedelics, which he details in his book Sacred Knowledge. Bill was a key figure in psychedelic research in the 60s and 70s and was instrumental in initiating the current renaissance in psychedelic research that began in the early 2000s. Today we talk about the research in this area, all the way from the 60s to the present day, as well as mystical and visionary experiences and much more.