OpenAI CEO Sam Altman, once a “very anxious, unhappy person,” credits a psychedelic experience at a weekend-long retreat with helping him become a new man. He’s not unique among Silicon Valley luminaries: Some of the 21st century’s most famous tech innovators, from Steve Jobs to Elon Musk and Sergey Brin, have reportedly sought out such experiences, too (on the record, or otherwise).

