 In addition to a raft of important academic publications, Dewey wrote for many non-academic audiences, notably via the New Republic; he was active in leading, supporting, or founding a number of important organizations including the American Civil Liberties Union, the American Association of University Professors, the American Philosophical Association, the American Psychological Association, and the New School for Social Research. Dewey was spoke out in support of both progressive politics and social change during the first part of the twentieth century. His renown as a philosopher and educator lead to numerous invitations; he inaugurated the Paul Carus Lectures (revised and published as Experience and Nature, 1925), gave the 1928 Gifford Lectures (revised and published as The Quest for Certainty, 1929), and gave the 1933–34 Terry Lectures at Yale (published as A Common Faith, 1934a). He traveled for two years in Japan and China, and also made notable trips to Turkey, Mexico, the Soviet Union, and South Africa.