 This work gained wide recognition and was for instance ranked by the Menninger Foundation among the 10 Classics of Psychotherapy.He was a founding member and the first President of the AGPA, which was keen to be well-recognized by psychiatrists; all of the 12 direct successors of the non-medical practitioner Slavson were in fact psychiatrists.Moreover, Slavson - who still exerted substantial influence in the organization after the end of his presidency in 1940 - strictly ensured that the institution remained classically Freudian, orthodox and in a clear defensive position to Neo-Freudians, existentialists and transactional analysts.