Andrew Jackson Davis (1826–1910), known as the “Poughkeepsie Seer,” was America’s most influential early Spiritualist and a pioneering figure in the harmonial philosophy movement. Born in Blooming Grove, New York, with little formal education, he discovered clairvoyant abilities in 1843 under mesmerism. In trance states he dictated his landmark 1847 book The Principles of Nature, Her Divine Revelations, and a Voice to Mankind, published just months before the Fox sisters’ rappings launched modern Spiritualism. Davis championed a cosmic spiritual evolution, blending Swedenborgian ideas with magnetism and progressive reform (abolitionism, women’s rights, health reform). His dozens of books and lectures shaped New Thought and American metaphysical religion profoundly.
