In one of the largest and most rigorous clinical investigations of psychedelic drugs to date, researchers at Johns Hopkins University and New York University have found that a single dose of psilocybin—the psychoactive compound in “magic” mushrooms—substantially diminished depression and anxiety in patients with advanced cancer.

Psychedelics were the subject of a flurry of serious medical research in the 1960s, when many scientists believed some of the mind-bending compounds held tremendous therapeutic promise for treating a number of conditions including severe mental health problems and alcohol addiction. But flamboyant Harvard psychology professor Timothy Leary—one of the top scientists involved—started aggressively promoting LSD as a consciousness expansion tool for the masses, and the youth counterculture movement answered the call in a big way. Leary lost his job and eventually became an international fugitive. Virtually all legal research on psychedelics shuddered to a halt when federal drug policies hardened in the 1970s.

The decades-long research blackout ended in 1999 when Roland Griffiths of Johns Hopkins was among the first to initiate a new series of studies on psilocybin. Griffiths has been called the grandfather of the current psychedelics research renaissance, and a 21st-century pioneer in the field—but the soft-spoken investigator is no activist or shaman/showman in the mold of Leary. He’s a scientifically cautious clinical pharmacologist and author of more than 300 studies on mood-altering substances from coffee to ketamine.

Much of Griffiths’ fascination with psychedelics stems from his own mindfulness meditation practice, which he says sparked his interest in altered states of consciousness. When he started administering psilocybin to volunteers for his research, he was stunned that more than two-thirds of the participants rated their psychedelic journey one of the most important experiences of their lives.

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