Pioneer in psychedelics Crossword Clue

 The pioneer in psychedelics that is often mentioned in crossword clues is Timothy Leary. He was an American psychologist and writer who was one of the early researchers of the potential benefits of psychedelic drugs, such as LSD and psilocybin. 

Leary was born in 1920 and studied psychology at Harvard University. He began experimenting with LSD in the 1950s and became convinced of its potential to help people with a variety of psychological problems. He wrote several books about his experiences with LSD and psilocybin, and he became a popular advocate for their use.

Leary's advocacy for psychedelics led to him being fired from Harvard and being investigated by the FBI. He continued to speak out about the potential benefits of psychedelics, and he became a counterculture icon. He died in 1996.

Other pioneers in psychedelics include:

Albert Hofmann, the Swiss chemist who first synthesized LSD in 1938.

Ralph Metzner, an American psychologist who co-authored several books with Leary, including "The Psychedelic Experience".

Stanislav Grof, a Czech-American psychiatrist who developed holotropic breathwork, a therapeutic technique that uses psychedelics to induce altered states of consciousness.

Ann Shulgin, an American chemist who co-authored several books with her husband, Alexander Shulgin, on the pharmacology of psychedelic drugs.

The research on the potential benefits of psychedelics is ongoing, and there is growing evidence that they can be helpful for a variety of mental health conditions, such as depression, anxiety, and addiction.