Carl Hart, Ph.D., is an associate professor of psychology and psychiatry at Columbia University, known for his research in drug abuse/drug addiction, and is the first tenured African America... Read allCarl Hart, Ph.D., is an associate professor of psychology and psychiatry at Columbia University, known for his research in drug abuse/drug addiction, and is the first tenured African American professor of sciences at Columbia University.Carl Hart, Ph.D., is an associate professor of psychology and psychiatry at Columbia University, known for his research in drug abuse/drug addiction, and is the first tenured African American professor of sciences at Columbia University.