Harriet de Wit, Ph.D., is Professor in the Department of Psychiatry and Behavioral Neuroscience at the University of Chicago.  She conducts laboratory-based studies investigating the acute effects of drugs with human volunteers.  She has studied the subjective, behavioral and physiological effects of a range of drugs including stimulants, sedatives, cannabinoids and alcohol, and more recently, also MDMA and very low doses of LSD.  She has published over 400 papers, and serves on editorial boards for several scientific journals.  She will review recent findings from her laboratory on effects of MDMA and low doses of LSD.