Hal Stone graduated from UCLA with a Ph.D. in psychology in 1953. He served in the Navy for four years as a psychologist, and later trained at the C.G. Jung Institute of Los Angeles. He remained there for 14 years, working as an analyst, and resigned in 1974. He is married to Sidra Stone. She graduated from Barnard with a Bachelor’s degree and received her Ph.D. from the University of Maryland in 1962. different points in her career.

Sidra Stone worked in the mental health field in public service, as well as privately as a psychotherapist. She was involved with the Veteran’s Administration and adolescent treatment centers at different points in her career.

The Stones developed Voice Dialogue based on their theory of the Psychology of Selves. This theory describes how each self relates to the others in relationships, both external and internal. The Psychology of Selves states that there are three dimensions to consciousness:

1. Awareness
2. Experience of the selves
3. Aware ego