Within the depth-psychology corpus assembled by Seba, ‘Klein’ refers overwhelmingly to Melanie Klein (1882–1960), the Austrian-British psychoanalyst whose theoretical innovations — the paranoid-schizoid and depressive positions, projective identification, primary envy, the internal object world, and the play technique — constitute one of the most consequential revisions of Freudian metapsychology in the twentieth century. Klein’s own writings, concentrated here in the posthumously collected *Envy and Gratitude and Other Works 1946–1963*, display the mature architecture of her system: a theory of early ego-splitting, persecutory and depressive anxiety, the death instinct as organismic given, and envy as the primal destructive force assailing the good object. Beyond her own texts, the corpus registers Klein through the testimonies of colleagues and successors. Ernest Jones marks her contribution as definitively established and historically decisive for the psychoanalysis of psychosis; Winnicott acknowledges a formative personal debt while maintaining significant independence; Bion inherits and transforms her conceptual apparatus. Tensions recorded in the corpus include the Controversial Discussions with Anna Freud’s school, epistemological debates over the status of infant fantasy, and Winnicott’s quiet dissent on the question of the facilitating environment. Isolated references to ‘Klein’ naming other figures — a Canadian poet, a pharmacologist — appear in bibliographic passages and carry no psychodynamic significance.