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Hefferline became a patient of Fritz Perls around 1946. He joined a small training group led by Perls in 1948 in New York, and went on to contribute a chapter to the book which defined Gestalt Therapy , Gestalt Therapy, Excitement and Growth in the Human Personality published in 1951. He was the third and junior author and provided the section containing practical exercises.
He went on to join the Behaviourist school of psychology
- Perls, Frederick S.; Hefferline, Ralph; Goodman, Paul. Gestalt Therapy, Excitement and Growth in the Human Personality. Gestalt Journal Press (This edition February , 1977 , but originally published 1951). ISBN 0-939266-24-5.
-  Ralph Franklin Hefferline: the Gestalt therapist among the Skinnerians or the Skinnerian among the Gestalt therapists? J Hist Behav Sci. 1986 Jan;22(1):49-60. PMID: 11608774
- Citations at Getcited.org
- Ralph Hepherline the Unkown Gestalt Therapist German magazine article - auto translationde:Ralph F. Hefferline