He discovered, synthesized, and personally tested over 230 psychoactive compounds, and evaluated them for their psychedelic and/or empathogenic potential. He is credited with introducing MDMA (also known as “ecstasy”) to psychologists in the late 1970s for psychopharmaceutical use, when it was originally used as a marriage-counselling drug.
Regardless of how you feel about the use of drugs (I personally feel they are more often a distraction from personal development than an ally), Alexander applied a rational and experimental approach to them, in the hopes of classifying these unique substances, and applying them to various social and medical problems. He saw them as methods to free humans of addiction, trauma, and chronic depression. May we all be so open-minded.