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William J Bernstein

William J. Bernstein is an American financial theorist, known for pioneering research in the field of modern portfolio theory. Bernstein is also highly regarded for his self-help finance books for individual investors who wish to manage their own equity portfolios. His publications include The Intelligent Asset Allocator; The Four Pillars of Investing: Lessons for Building a Winning Portfolio; and The Birth of Plenty, a history of the world's standard of living.