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Our guest was Dr. Niles Eldredge, a paleontologist who served as a curator at the American Museum of Natural History from 1969 until three years ago. He is well-known for his once controversial and now widely accepted evolutionary theory of “punctuated equilibria,” which he developed with Stephen Jay Gould. He is the author of many books, including The Pattern of Evolution, Life in the Balance, Why We Do It, and Darwin: Discovering the Tree of Life.