What is Obsessive-Compulsive Disorder (OCD)?

H. Blair Simpson, M.D., Ph.D.

“A mental illness characterized by two prominent symptoms: obsessions and compulsions. Obsessions are intrusive thoughts, images or impulses that repeatedly enter someone’s brain and that generate the stress and compulsions …”




Helen Blair Simpson, M.D., Ph.D.
2010 NARSAD Independent Investigator Grantee
Professor of Clinical Psychiatry
Director of the Anxiety Disorders Clinic
New York State Psychiatric Institute