By 1906, the group had grown to sixteen members, including Otto Rank, who was employed as the group's paid secretary. In the same year, Freud began a correspondence with Carl Gustav Jung who was by then already an academically acclaimed researcher into word-association and the Galvanic Skin Response, and a lecturer at Zurich University, although still only an assistant to Eugen Bleuler at the Burghölzli Mental Hospital in Zürich. In March 1907, Jung and Ludwig Binswanger, also a Swiss psychiatrist, travelled to Vienna to visit Freud and attend the discussion group. Thereafter, they established a small psychoanalytic group in Zürich. In 1908, reflecting its growing institutional status, the Wednesday group was reconstituted as the Vienna Psychoanalytic Society with Freud as president, a position he relinquished in 1910 in favor of Adler in the hope of neutralizing his increasingly critical standpoint.