https://en.wikipedia.org/wiki/Cornelius_Castoriadis
Psychoanalyst
When Jacques Lacan's disputes with the International Psychoanalytical Associationled to a split and the formation of the École Freudienne de Paris (EFP) in 1964, Castoriadis became a member (as a non-practitioner).[109] In 1968 Castoriadis married Piera Aulagnier, a French psychoanalyst who had undergone psychoanalytic treatment under Jacques Lacan from 1955 until 1961.[110]
In 1969 Castoriadis and Aulagnier split from the EFP to join the Organisation psychanalytique de langue française (OPLF), the so-called "Quatrième Groupe",[111] a psychoanalytic group that claims to follow principles and methods that have opened up a third way between Lacanianism and the standards of the International Psychoanalytical Association.[112] Castoriadis began to practice analysis in 1973 after he had undergone analysis in the 1960s first with Irène Roubleff and then later with Michel Renard.[111][113]