The other three original members whom Freud invited to attend, Alfred Adler, Max Kahane, and Rudolf Reitler, were also physicians and all five were Jewish by birth. Both Kahane and Reitler were childhood friends of Freud. Kahane had attended the same secondary school and both he and Reitler went to university with Freud. They had kept abreast of Freud's developing ideas through their attendance at his Saturday evening lectures. In 1901, Kahane, who first introduced Stekel to Freud's work, had opened an out-patient psychotherapy institute of which he was the director in Bauernmarkt, in Vienna. In the same year, his medical textbook, "Outline of Internal Medicine for Students and Practicing Physicians," was published. In it, he provided an outline of Freud's psychoanalytic method. Kahane broke with Freud and left the Wednesday Psychological Society in 1907 for unknown reasons and in 1923 committed suicide. Reitler was the director of an establishment providing thermal cures in Dorotheergasse which had been founded in 1901. He died prematurely in 1917. Adler, regarded as the most formidable intellect among the early Freud circle, was a socialist who in 1898 had written a health manual for the tailoring trade. He was particularly interested in the potential social impact of psychiatry.