 Brittain was an honorary life member of the CPU, attended many of its Quinquennial Conferences, regularly attended all its Council Meetings and Conferences, and in 1959 personally inaugurated its 50th (Golden Jubilee) Annual Conference.Harry Brittain was also an Honorary Member of the Foreign Press Association, the Association of American Correspondents in London and the Institute of Journalists.For many years, until the Anschluss, he was the only foreign Director of the Neue Freie Presse of Vienna.