Submit a tip
Do you have info to share with HuffPost reporters? Here’s how.
Assoc. professor of neuroscience, Columbia University
Carl L. Hart is an associate professor of psychology in the departments of psychiatry and psychology at Columbia University and a former member of the United Nations reference group for intravenous drug use and HIV.
By entering your email and clicking Sign Up, you're agreeing to let us send you customized marketing messages about us and our advertising partners. You are also agreeing to our Terms of Service and Privacy Policy.