Active in the early 1920s, F.C.S. Schiller labelled his work "humanism" but for Schiller the term referred to the pragmatist philosophy he shared with William James. In 1929, Charles Francis Potter founded the First Humanist Society of New York whose advisory board included Julian Huxley, John Dewey, Albert Einstein and Thomas Mann. Potter was a minister from the Unitarian tradition and in 1930 he and his wife, Clara Cook Potter, published Humanism: A New Religion. Throughout the 1930s, Potter was an advocate of such liberal causes as, women’s rights, access to birth control, "civil divorce laws", and an end to capital punishment.

What 19th century author associated his works with humanism?