The founder of the Order of the Solar Temple spent decades moving through the margins of esoteric movements before building the organization that would end in mass death. Di Mambro combined a long history of fraud and manipulation with genuine fluency in occult traditions, giving him both the tools and the credibility to attract followers willing to subordinate their lives — and deaths — to his authority. The October 1994 mass murder-suicides that killed him along with dozens of members across Switzerland and Quebec remain among the most studied episodes of destructive cult violence in modern history.