During this time, Masson befriended the psychoanalyst Kurt Eissler and became acquainted with Sigmund Freud's daughter Anna Freud. Eissler designated Masson to succeed him as Director of the Sigmund Freud Archives after his and Anna Freud's death. Masson learned German and studied the history of psychoanalysis. In 1980 Masson was appointed Projects Director of the Freud Archives, with full access to Freud's correspondence and other unpublished papers. While perusing this material, Masson concluded that Freud might have rejected the seduction theory in order to advance the cause of psychoanalysis and to maintain his own place within the psychoanalytic inner circle, after a hostile response from the renowned sex-pathologist Richard von Krafft-Ebing and the rest of the Vienna Psychiatric Society in 1896 - "an icy reception from the jackasses," was the way Freud described it later to Fliess