William James (1842–1910) was an American philosopher and psychologist who was a leading figure in the development of pragmatism and functionalist psychology. Born into a wealthy and intellectually distinguished New York family—his brother was the novelist Henry James—he trained as a physician at Harvard Medical School but never practiced, instead becoming one of the most versatile and influential American thinkers of his era. He established one of the first experimental psychology laboratories in the United States and wrote The Principles of Psychology (1890), a landmark work that helped establish psychology as a rigorous academic discipline. James then turned increasingly to philosophy, becoming the foremost champion of pragmatism—the view that the meaning and truth of ideas should be evaluated by their practical consequences and usefulness rather than by their correspondence to an abstract reality. His Varieties of Religious Experience (1902) examined mystical and conversion experiences across cultures and traditions with sympathetic rigor, arguing that religious experience is a legitimate subject of philosophical inquiry regardless of one's personal beliefs. His essays on radical empiricism proposed a vision of reality as pure experience prior to the division between subject and object. Warm, generous, and brilliantly readable, James brought philosophy out of the academic cloister and made it speak to the concerns of ordinary life.
