Gatekeepers, or nontraditional referral sources, have proven to be an effective means of case finding and outreach for the mental health needs of isolated senior citizens. A two-year project administered by the Public Health Division of the Health Services Department in a San Francisco Bay Area county found the gatekeeper concept to be an effective means of case finding in the public health setting. Program statistics showed similar profiles of individuals referred by gatekeepers and other referral sources except that gatekeepers referred more individuals living alone.