Susan Tross, Ph.D., is an Associate Professor of Clinical Psychology in the Departments of Psychiatry and Pediatrics at Columbia University. She is an Associate Director of the HIV Center and a Co-Director of the Interdisciplinary Research Methods Core. In addition, she is the Principal Investigator of the National Institute on Drug Abuse (NIDA)-funded research project  "Imipramine and Relapse Prevention in Depressed Methadone Patients." Since 1986, Dr. Tross has conducted several HIV intervention or substance abuse intervention research programs. She has particularly worked on peer-based and street-outreach programs programs among injecting drug users and their partners on the Lower East Side of Manhattan.

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