Castaneda first met Don Juan in the early 60's, before the hippy movement, before psychodelic drugs became popular. He was studying anthropology in Los Angeles, and Don Juan served as a field source for some fading knowledge of tribal and shamanistic rituals in Northern Mexico. Castaneda was specifically interested in peyote, a plant that gives its users hallicinations and mixes the senses in strange ways, and which LSD was meant to be a chemical reproduction of. Castaneda's first book presents a very detailed scholastic interpretation of his experiences. All books after the first simply focus on Castaneda's experiences with Don Juan.