Alfred North Whitehead

Alfred North Whitehead was a British mathematician and philosopher who collaborated with Bertrand Russell on the Principia Mathematica before developing one of the most original metaphysical systems of the twentieth century: process philosophy. Against the traditional conception of reality as composed of static substances, Whitehead argued that the fundamental constituents of reality are "actual occasions" — momentary events of experience constantly in process. His Process and Reality presents a comprehensive cosmology in which creativity and experience are the ultimate categories.