Douglas M. Ziedonis, MD, MPH, is Professor and Chair of the Department of Psychiatry at the University of Massachusetts Medical School and UMass Memorial Medical Center. Dr. Ziedonis is an internationally recognized leader in co-occurring mental illness and addiction, in particular tobacco dependence. He has served as an advisor to President Bush’s New Freedom Commission on Mental Health, a Senior Fellow for SAMHSA’s Co-Occurring Disorders Center for Excellence, and on various NIDA/NIMH study sections and advisory groups on addiction and mental illness.