Alexander "Sasha" Theodore Shulgin (born June 17, 1925) is an American pharmacologist, chemist and drug developer, credited with the popularization of MDMA, commonly known as ecstasy. Shulgin discovered, synthesized, and bioassayed over 230 psychoactive compounds. He and his wife Ann Shulgin authored the books PiHKAL and TiHKAL on the topic of psychoactive drugs.

On Wednesday, November 17, 2010 he had a stroke and since is recovering, but suffering from mild dementia.