C.D. Broad

Charlie Dunbar Broad, known as C.D. Broad, was an English philosopher who worked on epistemology, the history of philosophy, the philosophy of science, and ethics, as well as on the philosophical aspects of psychical research. He was known for his thorough and dispassionate examinations of arguments in works such as Scientific Thought (1923), The Mind and Its Place in Nature (1925), and Examination of McTaggart's Philosophy (two volumes, 1933 to 1938). His essay Determinism, Indeterminism, and Libertarianism, in Ethics and the History of Philosophy (1952), introduced the philosophical terms occurrent causation and non-occurrent causation, which became the basis for the contemporary distinction between agent-causal and event-causal positions in debates on libertarian free will.