Carl L. Hart (born October 30, 1966) is an American psychologist and neuroscientist, working as the Mamie Phipps Clark Professor of Psychology (in Psychiatry) at Columbia University. Hart is known for his research on drug abuse and drug addiction, his advocacy for the legalization of recreational drugs, and his recreational use of drugs. Hart became the first tenured African-American professor of sciences at Columbia University.
https://en.wikipedia.org/wiki/Carl_Hart