Health care has a history of tolerating intimidating and disruptive behavior by clinicians. However, with increased recognition of the importance of safety culture in preventing errors, organizations are taking steps to identify staff who regularly engage in demeaning or threatening behaviors. This study describes the development and pilot testing of the Johns Hopkins Disruptive Clinician Behavior Survey, which demonstrated high reliability in measuring disruptive behavior. A past AHRQ WebM&M perspective discusses how to identify and manage unprofessional behaviors.