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During this period, he produced many philosophical works such as The Study of the Natural Principle of Knowledge, The Concept of Nature, and The Theory of Relativity. The third period was his time in America making him “a leading philosopher” of England and America. US Flag Sunflower. This is the metaphysical period in Cambridge USA. Whitehead is a multifaceted philosopher, a renowned mathematician, one of the founders of modern mathematical logic and the author of the philosophy of organism.