Castle Peak Hospital (CPH) is the oldest and largest psychiatric hospital within the Hospital Authority. In addition to the provision of comprehensive psychiatric treatment and rehabilitation services, it has a long history and remarkable contributions in professional training, public education and research in mental health.

As it has become increasingly apparent that primary prevention strategies to increase positive mental health are an integral part of a comprehensive mental health service, with the leadership of the Hospital Governing Committee (HGC) of CPH, the Institute of Mental Health (IMH) was set up in February 2002.