C. D. Broad

Charlie Dunbar Broad, usually cited as C. D. Broad, was an English epistemologist, historian of philosophy, philosopher of science, moral philosopher, and writer on the philosophical aspects of psychical research. He was known for his thorough and dispassionate examinations of arguments in such works as Scientific Thought, published in 1923, The Mind and Its Place in Nature, published in 1925, and An Examination of McTaggart's Philosophy, published in 1933. Broad's essay on "Determinism, Indeterminism, and Libertarianism" in Ethics and the History of Philosophy introduced the philosophical terms "occurrent causation" and "non-occurrent causation", which became the basis for today's "agent causal" and "event causal" distinctions in the debates on libertarian free will.