Steven Marcus, PhD is an epidemiologist, statistician, computer scientist, and a mental health services researcher studying the outcomes, quality of care, and pharmacoepidemiology of patients with serious mental disorders. He also has a strong interest in the field of mental health patient safety where he examines the epidemiology, cause, and prevention of medical errors in psychiatry. Dr. Marcus' work has focused on designing, implementing, and analyzing results of a broad range of field research studies. Additionally, he analyzes large claims databases (pharmacy claims, Medicaid, private insurance), hospital discharge datasets, public use survey data, and smaller proprietary research databases to answer important national policy questions related to mental health quality of care and service use. He has served as a Principal Investigator or Co-Investigator on dozens of NIH funded grants. His research has led to hundreds of scholarly publications in leading academic journals.