William James

William James (1842–1910) was an American psychologist, philosopher, and founder of pragmatism—one of the most influential philosophical schools of the twentieth century. Born in New York to an intellectual family, James studied medicine, anatomy, and physiology before turning to psychology and philosophy, eventually holding appointments at Harvard University. His monumental The Principles of Psychology (1890) established psychology as an empirical science while introducing concepts such as the 'stream of consciousness' and the 'specious present' that remained foundational. His philosophical works—Pragmatism (1907), A Pluralistic Universe (1909), and Essays in Radical Empiricism (1912)—articulated pragmatism's core insight that truth is not a static property but something that 'works' in lived experience, and that philosophy should serve human purposes rather than abstract metaphysics. James's influence extended across psychology, philosophy of mind, philosophy of science, and American intellectual culture.