(1941–2002), US paleontologist. A noted popularizer of science, he studied modifications of Darwinian evolutionary theory, proposed the concept of punctuated equilibrium, and wrote on the social context of scientific theory. Notable works: Ever Since Darwin (1977), Bully for Brontosaurus (1992), The Lying Stones of Marrakesh: Penultimate Reflections in Natural History (2000), and The Structure of Evolutionary Theory (2002).