January 11, 1842 – August 26, 1910) was a pioneering American psychologist and philosopher. He wrote influential books on the young science of psychology, educational psychology, psychology of religious experience and mysticism, and the philosophy of pragmatism. He was the brother of novelist Henry James and of diarist Alice James. William James was born at the Astor House in New York City, son of Henry James, Sr., an independently wealthy and notoriously eccentric Swedenborgian theologian well acquainted with the literary and intellectual elites of his day. The intellectual brilliance of the James family milieu and the remarkable epistolary talents of several of its members have made them a subject of continuing interest to historians, biographers, and critics. James interacted with a wide array of writers and scholars throughout his life, including his godfather Ralph Waldo Emerson, Horace Greeley, William Cullen Bryant, Oliver Wendell Holmes, Jr., Charles Sanders Peirce, Josiah Royce, George Santayana, Ernst Mach, John Dewey, W.E.B. Du Bois, Helen Keller, Mark Twain, James Frazer, Henri Bergson, H. G. Wells, G. K. Chesterton, Sigmund Freud, Gertrude Stein, and Carl Jung.
William James, with his younger brother Henry James (who became a prominent novelist) and sister Alice James (who is known for her posthumously published diary), received an eclectic trans-Atlantic education, developing fluency in both German and French languages along with a cosmopolitan character. His family made two trips to Europe while he was still a child, setting a pattern that resulted in thirteen more European journeys during his life. His early artistic bent led to an early apprenticeship in the studio of William Morris Hunt in Newport, Rhode Island, but yielded in 1861 to scientific studies at Harvard University's Lawrence Scientific School. In his early adulthood, James suffered from a variety of physical and mental difficulties, including problems with his eyes, back, stomach, and skin, as well as periods of depression, and even attempted suicide. Two younger brothers, Garth Wilkinson (Wilky) and Robertson (Bob), fought in the Civil War, but the other three siblings (William, Henry, and Alice) all suffered from periods of invalidism. James switched to medical studies at Harvard Medical School in 1864. He took a break in the spring of 1865 to join Harvard's Louis Agassiz on a scientific expedition up the Amazon River, but aborted his trip after eight months, having suffered bouts of severe seasickness and mild smallpox. His studies were interrupted once again due to illness in April 1867. He traveled to Germany in search of a cure and remained until November 1868. (During this period he began to publish, with reviews appearing in literary periodicals like the North American Review.) He finally earned his M.D. degree in June 1869, but never practiced medicine. What he called his "soul-sickness" would only be resolved in 1872, after an extended period of philosophical searching. He married Alice Gibbens in 1878. James's time in Germany proved intellectually fertile, finding his true interests lay not in medicine but in philosophy and psychology. Later, in 1902 he would write: "I originally studied medicine in order to be a physiologist, but I drifted into psychology and philosophy from a sort of fatality. I never had any philosophic instruction, the first lecture on psychology I ever heard being the first I ever gave".
James spent his entire academic career at Harvard. He was appointed instructor in physiology for the spring 1873 term, instructor in anatomy and physiology in 1873, assistant professor of psychology in 1876, assistant professor of philosophy in 1881, full professor in 1885, endowed chair in psychology in 1889, return to philosophy in 1897, and emeritus professor of philosophy in 1907. James studied medicine, physiology, and biology, and began to teach in those...