Alexander Theodore "Sasha" Shulgin (June 17, 1925 – June 2, 2014) was an American biochemist, broad researcher of synthetic psychoactive compounds, and author of works regarding these, who independently explored the organic chemistry and pharmacology of such agents—in his mid-life and later, many through preparation in his home laboratory, and testing on himself.

Laura Ann Shulgin (Gotlieb; March 22, 1931 – July 9, 2022)Ruhe in Frieden, Ann Shulgin was an American author and the wife of chemist Alexander Shulgin, with whom she wrote PiHKAL and TiHKAL.

The (or "quantitative potency scale") a simple scale for reporting the subjective effect of psychoactive substances at a given dosage, and at a given time.